M365 Issue MacOS Client

Crashing eM Client
1

After initial setup and working for some time I get this error when syncing my M365 Account:

[Microsoft Graph] Die Synchronisation der Ordnerliste ist fehlgeschlagen mit folgendem Fehler: Arg_NullReferenceException

eM Client 11.0.1054+70b028aea4 (MAC)

22:22:42 XXXXXXX [Microsoft Graph] MailClient.Storage.Application.OperationException: Die Synchronisation der Ordnerliste ist fehlgeschlagen mit folgendem Fehler: Arg_NullReferenceException 
          ---> System.NullReferenceException: Arg_NullReferenceException
            at MailClient.Protocols.MSGraph.MSGraphFolderSynchronizer.GetMailFolderListAsync(CancellationToken cancellationToken)
            at MailClient.Protocols.MSGraph.MSGraphFolderSynchronizer.GetFolderListAsync(IListFoldersProgress progress, CancellationToken cancellationToken)
            at MailClient.Protocols.MSGraph.MSGraphFolderSynchronizer.GetFolderList(IListFoldersProgress progress, Folder homeFolder, CancellationToken cancellationToken)
            at MailClient.Protocols.Common.FolderSynchronizer.<>c__DisplayClass21_0.<RunEnqueueGetFolderList>b__0(WorkerStatus status, CancellationToken cancellationToken)
            at MailClient.Protocols.MSGraph.GenericMSGraphCommand.Execute(WorkerStatus status)
            Exception_EndOfInnerExceptionStack
            at MailClient.Protocols.MSGraph.GenericMSGraphCommand.Execute(WorkerStatus status)
            at MailClient.Commands.Command.Process(WorkerStatus status)
         --- End of stack trace from previous location ---
            at MailClient.Storage.Synchronization.FolderSynchronizerExtensions.SynchronizeSubfoldersAsync(IFolderSynchronizer synchronizer, Folder folder, SynchronizationPriority priority, CancellationToken cancellationToken)
            at MailClient.Protocols.MSGraph.MSGraphAccount.SynchronizeIntAsync(Boolean forced)
            at MailClient.Protocols.Common.SynchronizableMailAccount.<>c__DisplayClass30_0.<<SynchronizeAsync>b__0>d.MoveNext()
           AccountId = null
           AccountName = null
           RunInPlace = False
           GUIStatus_Exception_Reported = True
22:22:42 Beschaffung, Betrieb & Digitalisierung [Microsoft Graph] MailClient.Accounts.AuthenticationAbortedException: Authentifizierung abgebrochen
            at MailClient.Protocols.MSGraph.GenericMSGraphCommand.Execute(WorkerStatus status)
            at MailClient.Commands.Command.Process(WorkerStatus status)
           RunInPlace = False
           GUIStatus_Exception_Reported = True
2

Can’t reproduce this anymore. Perhaps a short M365 outage?