A few days back it looks like the Outlook sync doesn't work at all anymore. My outlook calendar is frozen in a previous state on my phone and when I added the app to a new computer, it doesn't populate it at all. Running on Android and two different Windows PCs.
Nullable object must have a value.
System.InvalidOperationException: Nullable object must have a value. at System.ThrowHelper.ThrowInvalidOperationException_InvalidOperation_NoValue() + 0x2d at System.Nullable`1.get_Value() + 0x12 at CalendarApp.MicrosoftGraphProvider.CachedMicrosoftAppointment.GetModifiedOccurrences() + 0x147 at CalendarApp.ProviderBase.CachedAppointment`1.SetRecurrenceEndDate() + 0xe5 at CalendarApp.ProviderBase.CachedAppointment`1.get_CurrentFieldValues() + 0x3c at CalendarApp.ProviderBase.CachedAppointment`1.SetRecurrenceEndDate() + 0x3a at CalendarApp.MicrosoftGraphProvider.CachedMicrosoftAppointment.AddOccurrence(Event) + 0x126 at CalendarApp.MicrosoftGraphProvider.MicrosoftGraphAccount.d__7.MoveNext() + 0xad6 --- End of stack