:::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/offline-address-book.png" alt-text="A screenshot of the OK page.":::Ī progress bar is displayed when the OAB is downloading. :::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/send-receive-groups-page.png" alt-text="A screenshot of the Send/Receive menu page."::: On the Send/Receive menu, select Send/Receive Groups, and then select Download Address Book. This should happen automatically every 24 hours, but it's important to have the most recent version to make sure that the correct delegate information is stored in the manager's mailbox. Highlight the entry in the pop-up window, and then select the X to delete the entry.įorce the Offline Address Book (OAB) to download. :::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/type-delegate-name.png" alt-text="A screenshot of removing any auto-complete entries page."::: Remove any auto-complete entries for the delegates.
:::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/dumpster-icon.png" alt-text="A screenshot of the dumpster icon on the Share this calendar page."::: Select the trash can icon to remove any delegates. :::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/share-button.png" alt-text="A screenshot of the Share button on the Outlook page."::: Follow these steps to check delegates in OWA: Sign in to the mailbox through Outlook Web App (OWA), and then confirm that all delegates are removed. If users continue to receive an NDR when they send meeting invites to the manager, continue through the remaining steps to make sure that all cached delegate information is removed from the mailbox. :::image type="content" source="media/ndr-5-2-0-when-sending-meeting-invites/remove-delegates.png" alt-text="A screenshot of the dialog to remove delegates.":::īefore you move on to the next steps, confirm whether the issue is now resolved.
Remove all delegates from the Delegates dialog box in Outlook. The manager should readd the delegate after making sure that there are no cached references to the delegate's original object. The delegate's old value for the legacyExchangeDN attribute is stored on the local free/busy object in the manager's mailbox. DelegateUserValidationException: Delegate user validation failed for user:DelegateName. Remote Server returned '554 5.2.0 :DelegateUserValidationException Failed to process message due to a permanent exception with message Delegate user validation failed for user:DelegateName. Users receive NDR 5.2.0 when they send meeting invites in Microsoft 365 hybrid environmentĪfter a delegate's or manager's mailbox is moved to a new forest in Microsoft 365, users receive the following non-delivery report (NDR) when they send meeting invites to the manager:
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