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[GH-ISSUE #2110] You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure. #1416

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opened 2026-02-25 22:39:57 +03:00 by kerem · 8 comments

kerem commented

2026-02-25 22:39:57 +03:00

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Originally created by @RealFakeGitter on GitHub (Nov 29, 2025).
Original GitHub issue: https://github.com/floccusaddon/floccus/issues/2110

Which version of floccus are you using?

5.7.0

How many bookmarks do you have, roughly?

550

Are you using other means to sync bookmarks in parallel to floccus?

Sync method

Google Drive

Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

142.0.7444.175 (Official Build, ungoogled-chromium) Arch Linux (64-bit)

Which version of Nextcloud Bookmarks are you using? (if relevant)

No response

Which version of Nextcloud? (if relevant)

No response

What kind of WebDAV server are you using? (if relevant)

No response

Describe the Bug

When i click sign in on google i get met with
"You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure.

You can let the app developer know that this app doesn't comply with one or more Google validation rules.
Learn more about this error
If you are a developer of floccus bookmark sync, see error details.
Error 400: invalid_request"

Expected Behavior

I sign in and sync with no issues and sync bookmarks

To Reproduce

Add profile, go to google drive, sign in.

Debug log provided

I have provided a debug log file

Originally created by @RealFakeGitter on GitHub (Nov 29, 2025). Original GitHub issue: https://github.com/floccusaddon/floccus/issues/2110 ### Which version of floccus are you using? 5.7.0 ### How many bookmarks do you have, roughly? 550 ### Are you using other means to sync bookmarks in parallel to floccus? no ### Sync method Google Drive ### Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please. 142.0.7444.175 (Official Build, ungoogled-chromium) Arch Linux (64-bit) ### Which version of Nextcloud Bookmarks are you using? (if relevant) _No response_ ### Which version of Nextcloud? (if relevant) _No response_ ### What kind of WebDAV server are you using? (if relevant) _No response_ ### Describe the Bug When i click sign in on google i get met with "You can't sign in to this app because it doesn't comply with Google's OAuth 2.0 policy for keeping apps secure. You can let the app developer know that this app doesn't comply with one or more Google validation rules. [Learn more about this error](https://developers.google.com/identity/protocols/oauth2/policies#secure-response-handling) If you are a developer of floccus bookmark sync, see error details. Error 400: invalid_request" <img width="1247" height="636" alt="Image" src="https://github.com/user-attachments/assets/c077a171-670b-4e94-a3c3-adce9eb0c025" /> ### Expected Behavior I sign in and sync with no issues and sync bookmarks ### To Reproduce Add profile, go to google drive, sign in. ### Debug log provided - [ ] I have provided a debug log file

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2026-02-25 22:39:57 +03:00

kerem commented

2026-02-25 22:39:57 +03:00

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@github-actions[bot] commented on GitHub (Nov 29, 2025):

Hello! 👋

Thank you for taking the time to open this issue with floccus. I know it's frustrating when software causes problems. You have made the right choice to come here and open an issue to make sure your problem gets looked at and if possible solved. Let me give you a short introduction on what to expect from this issue tracker to avoid misunderstandings. I'm Marcel. I created floccus a few years ago, and have been maintaining it since. I currently work for Nextcloud which leaves me with less time for side projects like this one than I used to have. I still try to answer all issues and if possible fix all bugs here, but it sometimes takes a while until I get to it. Until then, please be patient. It helps when you stick around to answer follow up questions I may have, as very few bugs can be fixed directly from the first bug report, without any interaction. If information is missing in your bug report and the issue cannot be solved without it, I will have to close the issue after a while. Note also that GitHub in general is a place where people meet to make software better together. Nobody here is under any obligation to help you, solve your problems or deliver on any expectations or demands you may have, but if enough people come together we can collaborate to make this software better. For everyone. Thus, if you can, you could also have a look at other issues to see whether you can help other people with your knowledge and experience. If you have coding experience it would also be awesome if you could step up to dive into the code and try to fix the odd bug yourself. Everyone will be thankful for extra helping hands! If you cannot lend a helping hand, to continue the development and maintenance of this project in a sustainable way, I ask that you donate to the project when opening an issue (or at least once your issue is solved), if you're not a donor already. You can find donation options at https://floccus.org/donate/. Thank you!

One last word: If you feel, at any point, like you need to vent, this is not the place for it; you can go to the Nextcloud forum, to twitter or somewhere else. But this is a technical issue tracker, so please make sure to focus on the tech and keep your opinions to yourself.

Thank you for reading through this primer. I look forward to working with you on this issue! Cheers! 💙

@github-actions[bot] commented on GitHub (Nov 29, 2025): Hello! :wave: Thank you for taking the time to open this issue with floccus. I know it's frustrating when software causes problems. You have made the right choice to come here and open an issue to make sure your problem gets looked at and if possible solved. Let me give you a short introduction on what to expect from this issue tracker to avoid misunderstandings. I'm Marcel. I created floccus a few years ago, and have been maintaining it since. I currently work for Nextcloud which leaves me with less time for side projects like this one than I used to have. I still try to answer all issues and if possible fix all bugs here, but it sometimes takes a while until I get to it. Until then, please be patient. It helps when you stick around to answer follow up questions I may have, as very few bugs can be fixed directly from the first bug report, without any interaction. If information is missing in your bug report and the issue cannot be solved without it, I will have to close the issue after a while. Note also that GitHub in general is a place where people meet to make software better *together*. Nobody here is under any obligation to help you, solve your problems or deliver on any expectations or demands you may have, but if enough people come together we can collaborate to make this software better. For everyone. Thus, if you can, you could also have a look at other issues to see whether you can help other people with your knowledge and experience. If you have coding experience it would also be awesome if you could step up to dive into the code and try to fix the odd bug yourself. Everyone will be thankful for extra helping hands! If you cannot lend a helping hand, to continue the development and maintenance of this project in a sustainable way, I ask that you donate to the project when opening an issue (or at least once your issue is solved), if you're not a donor already. You can find donation options at <https://floccus.org/donate/>. Thank you! One last word: If you feel, at any point, like you need to vent, this is not the place for it; you can go to the Nextcloud forum, to twitter or somewhere else. But this is a technical issue tracker, so please make sure to focus on the tech and keep your opinions to yourself. Thank you for reading through this primer. I look forward to working with you on this issue! Cheers! :blue_heart:

kerem commented

2026-02-25 22:39:57 +03:00

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@marcelklehr commented on GitHub (Nov 30, 2025):

Hi @RealFakeGitter
this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google.

@marcelklehr commented on GitHub (Nov 30, 2025): Hi @RealFakeGitter this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google.

kerem commented

2026-02-25 22:39:57 +03:00

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@RealFakeGitter commented on GitHub (Nov 30, 2025):

Hi @RealFakeGitter this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google.

I see. Thanks for the reply, that is unfortunate. I tried to use Nexcloud instead and it just never synced. Hopefully they fix it one day. 😅

@RealFakeGitter commented on GitHub (Nov 30, 2025): > Hi [@RealFakeGitter](https://github.com/RealFakeGitter) this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google. I see. Thanks for the reply, that is unfortunate. I tried to use Nexcloud instead and it just never synced. Hopefully they fix it one day. 😅

kerem commented

2026-02-25 22:39:57 +03:00

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@marcelklehr commented on GitHub (Nov 30, 2025):

I tried to use Nexcloud instead and it just never synced.

I may be able to help here too, what exactly did you try?

@marcelklehr commented on GitHub (Nov 30, 2025): > I tried to use Nexcloud instead and it just never synced. I may be able to help here too, what exactly did you try?

kerem commented

2026-02-25 22:39:57 +03:00

Author

Owner

@RealFakeGitter commented on GitHub (Nov 30, 2025):

I tried to use Nexcloud instead and it just never synced.

I may be able to help here too, what exactly did you try?

Well I can't say I know what I'm doing but I have a nextcloud account all I did was try to login to my nextcloud instance that part worked with no issues and gave me no errors. But it started "syncing" and literally just never synced. I don't really know how to make it work I guess I'm completely new to nextcloud.

@RealFakeGitter commented on GitHub (Nov 30, 2025): > > I tried to use Nexcloud instead and it just never synced. > > I may be able to help here too, what exactly did you try? Well I can't say I know what I'm doing but I have a nextcloud account all I did was try to login to my nextcloud instance that part worked with no issues and gave me no errors. But it started "syncing" and literally just never synced. I don't really know how to make it work I guess I'm completely new to nextcloud.

kerem commented

2026-02-25 22:39:57 +03:00

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Owner

@marcelklehr commented on GitHub (Nov 30, 2025):

There's two ways to sync with nextcloud:

Nextcloud Bookmarks for this option you need to install the Bookmarks app on your Nextcloud, the rest should be self explanatory
WebDAV this option will store the bookmarks in your Nextcloud files as an XBEL/HTML file. The URL you need to enter is special: Instead of https://your-nextcloud.com/ you need to enter https://your-nextcloud.com/remote.php/webdav/, the rest is again self explanatory

Let me know how it goes :)

@marcelklehr commented on GitHub (Nov 30, 2025): There's two ways to sync with nextcloud: * **Nextcloud Bookmarks** for this option you need to install the Bookmarks app on your Nextcloud, the rest should be self explanatory * **WebDAV** this option will store the bookmarks in your Nextcloud files as an XBEL/HTML file. The URL you need to enter is special: Instead of `https://your-nextcloud.com/` you need to enter `https://your-nextcloud.com/remote.php/webdav/`, the rest is again self explanatory Let me know how it goes :)

kerem commented

2026-02-25 22:39:57 +03:00

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@Mayurifag commented on GitHub (Dec 30, 2025):

Having the same problem on Helium browser. Was fine with Thorium. "Thanks", google.

@Mayurifag commented on GitHub (Dec 30, 2025): Having the same problem on Helium browser. Was fine with Thorium. "Thanks", google.

kerem commented

2026-02-25 22:39:57 +03:00

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@mattzink commented on GitHub (Dec 31, 2025):

Hi @RealFakeGitter this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google.

I just tried this workaround (exported a floccus profile from Edge and imported into ungoogled-chromium) and was able to sync! Thanks for suggesting this!

@mattzink commented on GitHub (Dec 31, 2025): > Hi [@RealFakeGitter](https://github.com/RealFakeGitter) this is a known issue with ungoogled-chromium. You can try importing an existing profile from a different browser, which may work, but the OAuth redirect URL from ungoogled-chromium is not supported by google. I just tried this workaround (exported a floccus profile from Edge and imported into ungoogled-chromium) and was able to sync! Thanks for suggesting this!

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