The specified object was not found in the store (ErrorItemNotFound)

I am assuming this error is related to the sync problem that Microsoft created on 3/8/23. The content of the error is below. Any help is appreciated if this is an unrelated event.

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CalendarApp.ProviderBase.Exceptions.AccountRequestException: The specified object was not found in the store. (ErrorItemNotFound) ---> CalendarApp.Common.Net.HttpException: Not found (404).

Response status code does not indicate success: 404 (Not Found). ---> System.Exception: Not found (404).

Response status code does not indicate success: 404 (Not Found).
at System.Runtime.InteropServices.McgMarshal.ThrowOnExternalCallFailed(Int32, RuntimeTypeHandle) + 0x21
at __Interop.ComCallHelpers.Call(__ComObject, RuntimeTypeHandle, Int32, Void*) + 0xbe
at __Interop.ForwardComStubs.Stub_2[TThis, TResult](__ComObject, Int32) + 0x37
at Windows.Web.Http.HttpResponseMessage.EnsureSuccessStatusCode() + 0x18
at CalendarApp.Common.Net.CalendarHttpClient.d__29.MoveNext() + 0x82d

--- End of inner exception stack trace ---
at CalendarApp.Common.Net.CalendarHttpClient.d__29.MoveNext() + 0x18b0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at CalendarApp.Common.Net.JsonHttpWebRequest.d__0.MoveNext() + 0x109
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at CalendarApp.ProviderBase.Json.OAuthJsonBase.d__16`1.MoveNext() + 0x2c1

--- End of inner exception stack trace ---
at CalendarApp.ProviderBase.Json.OAuthJsonBase.HandleExecuteRequestException(HttpMethod, String, Boolean, String, String, Exception) + 0x167
at CalendarApp.ProviderBase.Json.OAuthJsonBase.d__16`1.MoveNext() + 0x5db
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at CalendarApp.ProviderBase.Json.OAuthJsonBase.d__12`2.MoveNext() + 0x1fb
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at CalendarApp.MicrosoftGraphProvider.MicrosoftGraphApi.d__7.MoveNext() + 0x13c
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0xb
at CalendarApp.MicrosoftGraphProvider.MicrosoftGraphAccount.d__13.MoveNext() + 0x81
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at CalendarApp.ProviderBase.AccountProviderBase`9.d__91.MoveNext() + 0xc6
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17
at System.Runtime.CompilerServices.TaskAwaiter.GetResult() + 0xb
at CalendarApp.ProviderBase.AccountProviderBase`9.d__89.MoveNext() + 0x275