Hi @Joy Zhang-MSFT ,
OWA and Outlook work without any problems. "ApplyMandatoryProperties" reports that nothing had to be changed.
The only place where the error message appears is in the "BigFunnelRetryFeederTimeBasedAssistant" log file. And since then the email search no longer works either. For me it seems as if the BigFunnel service has no more access rights to the mailboxes since the update and can therefore no longer index them.
The complete error message is:
2021-10-04T03:52:01.266Z,Failures,1,BigFunnelRetryFeederTimeBasedAssistant_60197682,,"Retry Failure for mailbox c487d783-da28-4ddb-9424-6de51163f0cf with error : RetriableItem.Retry for Item with StoreId: Frs0HL8meWVAhSj6Amx4aqAAAo0JIXNGAAAAADen564zGopMgifJfxKRmucHACyR+xGK8YxKuFmWkGDLI8YAAAEaC2wAALs0HL8meWVAhSj6Amx4aqAAAoyJTn4AAAk=, BigFunnelCorrelationId: c58e26fa-778a-41e2-9c8f-f36f20bd3492, Item Class: IPM.AuditLog failed with Exception: Microsoft.Exchange.Data.Storage.AccessDeniedException: Im Ordner „Überprüfungen“ vorhandene Elemente können nicht aktualisiert werden.\r\n bei Microsoft.Exchange.Data.Storage.COWLogProtector.SkipItemOperation(COWSettings settings, IDumpsterItemOperations dumpster, COWTriggerAction operation, COWTriggerActionState state, IStoreSession session, StoreObjectId itemId, ICoreItem item, Boolean onBeforeNotification, Boolean onDumpster, Boolean success, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.COWSession.<>c__DisplayClass60_1.<InternalItemChange>b__0()\r\n bei Microsoft.Exchange.Data.Storage.COWSession.InternalItemChange(COWTriggerAction operation, COWTriggerActionState state, IStoreSession session, StoreId itemId, ICoreItem item, Boolean onBeforeNotification, Boolean success, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.COWSession.OnBeforeItemChange(COWTriggerAction operation, IStoreSession session, StoreId itemId, ICoreItem item, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.Adapters.ObjectEventHandlers.CopyOnWriteEventHandler.Handle(BeforeItemFlushEvent onBeforeItemFlushArgs)\r\n bei Microsoft.Exchange.Data.StoreObjects.Extensibility.InlineEvent.EventDispatcher.<>c__DisplayClass4_1`1.<Dispatch>b__0()\r\n bei Microsoft.Exchange.Data.StoreObjects.Extensibility.InlineEvent.EventDispatcher.Dispatch[TEvent](TEvent eventData)\r\n bei Microsoft.Exchange.Data.Storage.CoreItem.InternalFlush(SaveMode saveMode, CoreItemOperation operation, OperationContext operationContext)\r\n bei Microsoft.Exchange.Data.Storage.CoreItem.SaveOrSend(SaveMode saveMode, OperationContext operationContext, CoreItemOperation operation)\r\n bei Microsoft.Exchange.Data.Storage.Item.SaveInternal(SaveMode saveMode, Boolean commit, OperationContext operationContext, CoreItemOperation operation)\r\n bei Microsoft.Exchange.Data.Storage.Item.Save(SaveMode saveMode)\r\n bei Microsoft.Exchange.Search.BigFunnel.RetryFeeder.RetriableItem.<>c__DisplayClass7_0.<Retry>b__0()\r\n bei Microsoft.Exchange.Data.Storage.MailboxSession.BypassAuditsFolderAccessChecking(Action action)\r\n bei Microsoft.Exchange.Search.BigFunnel.RetryFeeder.RetriableItem.Retry(IRetryContext retryContext)",
2021-10-04T03:52:01.268Z,Failures,1,BigFunnelRetryFeederTimeBasedAssistant_60197682,,"Retry Failure for mailbox c487d783-da28-4ddb-9424-6de51163f0cf with error : DoRetryItem failed: Microsoft.Exchange.Data.Storage.AccessDeniedException: Im Ordner „Überprüfungen“ vorhandene Elemente können nicht aktualisiert werden.\r\n bei Microsoft.Exchange.Data.Storage.COWLogProtector.SkipItemOperation(COWSettings settings, IDumpsterItemOperations dumpster, COWTriggerAction operation, COWTriggerActionState state, IStoreSession session, StoreObjectId itemId, ICoreItem item, Boolean onBeforeNotification, Boolean onDumpster, Boolean success, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.COWSession.<>c__DisplayClass60_1.<InternalItemChange>b__0()\r\n bei Microsoft.Exchange.Data.Storage.COWSession.InternalItemChange(COWTriggerAction operation, COWTriggerActionState state, IStoreSession session, StoreId itemId, ICoreItem item, Boolean onBeforeNotification, Boolean success, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.COWSession.OnBeforeItemChange(COWTriggerAction operation, IStoreSession session, StoreId itemId, ICoreItem item, CallbackContext callbackContext)\r\n bei Microsoft.Exchange.Data.Storage.Adapters.ObjectEventHandlers.CopyOnWriteEventHandler.Handle(BeforeItemFlushEvent onBeforeItemFlushArgs)\r\n bei Microsoft.Exchange.Data.StoreObjects.Extensibility.InlineEvent.EventDispatcher.<>c__DisplayClass4_1`1.<Dispatch>b__0()\r\n bei Microsoft.Exchange.Data.StoreObjects.Extensibility.InlineEvent.EventDispatcher.Dispatch[TEvent](TEvent eventData)\r\n bei Microsoft.Exchange.Data.Storage.CoreItem.InternalFlush(SaveMode saveMode, CoreItemOperation operation, OperationContext operationContext)\r\n bei Microsoft.Exchange.Data.Storage.CoreItem.SaveOrSend(SaveMode saveMode, OperationContext operationContext, CoreItemOperation operation)\r\n bei Microsoft.Exchange.Data.Storage.Item.SaveInternal(SaveMode saveMode, Boolean commit, OperationContext operationContext, CoreItemOperation operation)\r\n bei Microsoft.Exchange.Data.Storage.Item.Save(SaveMode saveMode)\r\n bei Microsoft.Exchange.Search.BigFunnel.RetryFeeder.RetriableItem.<>c__DisplayClass7_0.<Retry>b__0()\r\n bei Microsoft.Exchange.Data.Storage.MailboxSession.BypassAuditsFolderAccessChecking(Action action)\r\n bei Microsoft.Exchange.Search.BigFunnel.RetryFeeder.RetriableItem.Retry(IRetryContext retryContext)\r\n bei Microsoft.Exchange.MailboxAssistants.Assistants.BigFunnelRetryFeederTimeBasedAssistant.BigFunnelRetryFeederTimeBasedAssistant.DoRetryItem(BigFunnelRetryFeederTaskContext context)",