[GH-ISSUE #288] 401 Unauthorized Error on Azure Single Sign-On #1181

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opened 2026-03-14 00:33:58 +03:00 by kerem · 4 comments

kerem commented

2026-03-14 00:33:58 +03:00

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Originally created by @twes3 on GitHub (Oct 6, 2020).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/288

We use Confluence as a platform and would like to use CalDav-Synchronizer to Synch Calendars between Confluence and Outlook.
To log into Confluence we recently switched to Azure AD and Single Sign On.

However, now CalDav can't access Confluence any more, even though the credentials are correct.
Up until this point, the calendar synchronization was working perfectly well.

I've attached the error message:

Any help is appreciated.

Originally created by @twes3 on GitHub (Oct 6, 2020). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/288 We use Confluence as a platform and would like to use CalDav-Synchronizer to Synch Calendars between Confluence and Outlook. To log into Confluence we recently switched to Azure AD and Single Sign On. However, now CalDav can't access Confluence any more, even though the credentials are correct. Up until this point, the calendar synchronization was working perfectly well. I've attached the error message: ![grafik](https://user-images.githubusercontent.com/45464588/95203649-5467ee00-07e3-11eb-98de-e6e3eb6b2409.png) Any help is appreciated.

kerem closed this issue

2026-03-14 00:34:03 +03:00

kerem commented

2026-03-14 00:34:09 +03:00

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@aluxnimm commented on GitHub (Oct 6, 2020):

Did you try different auth options?

If you expand the tree view of the profile you can configure network and proxy options and mapping configuration options. (only in advanced settings)

See force basic auth/preemptive auth settings there.

@aluxnimm commented on GitHub (Oct 6, 2020): Did you try different auth options? If you expand the tree view of the profile you can configure network and proxy options and mapping configuration options. (only in advanced settings) See force basic auth/preemptive auth settings there.

kerem commented

2026-03-14 00:34:14 +03:00

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@twes3 commented on GitHub (Oct 6, 2020):

Thank you for the answer, unfortunately it didn't solve the problem.
I tried any combination of basic auth/preemptive auth without luck.

Any other suggestions?

@twes3 commented on GitHub (Oct 6, 2020): Thank you for the answer, unfortunately it didn't solve the problem. I tried any combination of basic auth/preemptive auth without luck. Any other suggestions?

kerem commented

2026-03-14 00:34:19 +03:00

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@tpenndorf commented on GitHub (Nov 5, 2020):

Hi,
the question is: Is the outlook synchronizer able to authenticate via SAML?

@tpenndorf commented on GitHub (Nov 5, 2020): Hi, the question is: Is the outlook synchronizer able to authenticate via SAML?

kerem commented

2026-03-14 00:34:24 +03:00

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@twes3 commented on GitHub (Nov 12, 2020):

We managed to find a working solution for this issue:

When using SAML SSO in Confluence Datacenter/ Server and Team Calendars from Atlassian, https://marketplace.atlassian.com/apps/72307/team-calendars-for-confluence?hosting=server&tab=overview, you can use this API Token app https://marketplace.atlassian.com/apps/72307/team-calendars-for-confluence?hosting=server&tab=overview. Since it's latest release (1.5.1, released on 11/10/2020) it also supports CalDAV. Every user can then create a personal token which replaces the password in the CalDAV Synchronizer Outlook profile.
Confluence Cloud already provides API Tokens by default, so it should also work.

@twes3 commented on GitHub (Nov 12, 2020): We managed to find a working solution for this issue: When using SAML SSO in Confluence Datacenter/ Server and Team Calendars from Atlassian, [https://marketplace.atlassian.com/apps/72307/team-calendars-for-confluence?hosting=server&tab=overview](https://marketplace.atlassian.com/apps/72307/team-calendars-for-confluence?hosting=server&tab=overview), you can use this API Token app [https://marketplace.atlassian.com/apps/72307/team-calendars-for-confluence?hosting=server&tab=overview](https://marketplace.atlassian.com/apps/1221608/api-token-authentication-confluence?hosting=server&tab=overview). Since it's latest release (1.5.1, released on 11/10/2020) it also supports CalDAV. Every user can then create a personal token which replaces the password in the CalDAV Synchronizer Outlook profile. Confluence Cloud already provides API Tokens by default, so it should also work.