[GH-ISSUE #402] Outlook --> Google Calendar sync returning sporadic 400s #387

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opened 2026-02-25 20:31:32 +03:00 by kerem · 1 comment

kerem commented

2026-02-25 20:31:32 +03:00

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Originally created by @brianabauman on GitHub (Aug 30, 2023).
Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/402

On version 4.4.1.0, I'm experiencing sporadic failures to sync my calendar with Google. The error message is:

<SynchronizationReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <ProfileName><MY_COMPANY_NAME></ProfileName>
  <ProfileId>5174bc99-e361-44fd-a5ad-9517c2e26329</ProfileId>
  <StartTime>2023-08-30T15:56:03.1853703Z</StartTime>
  <ADelta>Unchanged: 39 , Added: 0 , Deleted 0 ,  Changed 1</ADelta>
  <BDelta>Unchanged: 39 , Added: 0 , Deleted 1 ,  Changed 0</BDelta>
  <AJobsInfo>Create 0 , Update 0 , Delete 0</AJobsInfo>
  <BJobsInfo>Create 1 , Update 1 , Delete 0</BJobsInfo>
  <LoadErrors />
  <EntitySynchronizationReports>
    <EntitySynchronizationReport>
      <MappingErrors />
      <MappingWarnings />
      <AId>00000000BF52EF0EAEA5B240972DCDB6CACC5C110700DA1624C5EA18C4448BB5F95F36652FC900000D5A0FA4000002965CE105254646BC89ED4CF2BB63960000B43680520000</AId>
      <BId>/caldav/v2/b<MY_EMAIL_ADDRESS>/events/140abdee-3deb-4f7b-b2a5-a1d8a213d13f.ics</BId>
      <ExceptionThatLeadToAbortion>CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '400' ('Bad Request'). Message:
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;D:error xmlns:D="DAV:"/&gt;

   at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.&lt;EnsureSuccessStatusCode&gt;d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.&lt;ExecuteWebDavRequest&gt;d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.&lt;ExecuteWebDavRequestAndReturnResponseHeaders&gt;d__8.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.DataAccess.CalDavDataAccess.&lt;TryUpdateEntity&gt;d__28.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at CalDavSynchronizer.Implementation.CalDavRepository`1.&lt;TryUpdate&gt;d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at CalDavSynchronizer.Implementation.CalDavRepository`1.&lt;TryUpdate&gt;d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.&lt;PerformOperations&gt;d__3.MoveNext()</ExceptionThatLeadToAbortion>
      <Operation>UpdateInB</Operation>
    </EntitySynchronizationReport>
  </EntitySynchronizationReports>
  <ConsiderExceptionThatLeadToAbortionAsWarning>false</ConsiderExceptionThatLeadToAbortionAsWarning>
  <Duration>00:00:01.5034520</Duration>
</SynchronizationReport>

Did anything change on Google's API? The issue is sporadic -- it's not clear why some syncs fail. What other debugging information can I provide?

Originally created by @brianabauman on GitHub (Aug 30, 2023). Original GitHub issue: https://github.com/aluxnimm/outlookcaldavsynchronizer/issues/402 On version 4.4.1.0, I'm experiencing sporadic failures to sync my calendar with Google. The error message is: ```<?xml version="1.0" encoding="utf-16"?> <SynchronizationReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <ProfileName><MY_COMPANY_NAME></ProfileName> <ProfileId>5174bc99-e361-44fd-a5ad-9517c2e26329</ProfileId> <StartTime>2023-08-30T15:56:03.1853703Z</StartTime> <ADelta>Unchanged: 39 , Added: 0 , Deleted 0 , Changed 1</ADelta> <BDelta>Unchanged: 39 , Added: 0 , Deleted 1 , Changed 0</BDelta> <AJobsInfo>Create 0 , Update 0 , Delete 0</AJobsInfo> <BJobsInfo>Create 1 , Update 1 , Delete 0</BJobsInfo> <LoadErrors /> <EntitySynchronizationReports> <EntitySynchronizationReport> <MappingErrors /> <MappingWarnings /> <AId>00000000BF52EF0EAEA5B240972DCDB6CACC5C110700DA1624C5EA18C4448BB5F95F36652FC900000D5A0FA4000002965CE105254646BC89ED4CF2BB63960000B43680520000</AId> <BId>/caldav/v2/b<MY_EMAIL_ADDRESS>/events/140abdee-3deb-4f7b-b2a5-a1d8a213d13f.ics</BId> <ExceptionThatLeadToAbortion>CalDavSynchronizer.DataAccess.WebDavClientException: Response status code does not indicate success: '400' ('Bad Request'). Message: <?xml version="1.0" encoding="UTF-8"?> <D:error xmlns:D="DAV:"/> at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<EnsureSuccessStatusCode>d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequest>d__9.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.DataAccess.HttpClientBasedClient.WebDavClient.<ExecuteWebDavRequestAndReturnResponseHeaders>d__8.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.DataAccess.CalDavDataAccess.<TryUpdateEntity>d__28.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at CalDavSynchronizer.Implementation.CalDavRepository`1.<TryUpdate>d__16.MoveNext() --- End of stack trace from previous location where exception was thrown --- at CalDavSynchronizer.Implementation.CalDavRepository`1.<TryUpdate>d__16.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) at GenSync.EntityRepositories.BatchEntityRepositoryAdapter`4.<PerformOperations>d__3.MoveNext()</ExceptionThatLeadToAbortion> <Operation>UpdateInB</Operation> </EntitySynchronizationReport> </EntitySynchronizationReports> <ConsiderExceptionThatLeadToAbortionAsWarning>false</ConsiderExceptionThatLeadToAbortionAsWarning> <Duration>00:00:01.5034520</Duration> </SynchronizationReport> ``` Did anything change on Google's API? The issue is sporadic -- it's not clear why some syncs fail. What other debugging information can I provide?

kerem commented

2026-02-25 20:31:32 +03:00

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Owner

@Qtax commented on GitHub (May 6, 2025):

Same problem. Getting 400 sporadically.

Today no synchronizations worked at all (same 400 error), tried manually several times. Then enabled "Use WebDAV collection sync" and it started working again 🤷

@Qtax commented on GitHub (May 6, 2025): Same problem. Getting 400 sporadically. Today no synchronizations worked at all (same 400 error), tried manually several times. Then enabled "Use WebDAV collection sync" and it started working again 🤷