An AD account was disabled from AD. But it did not delete the mailbox in cloud as usual. The mailbox in cloud is still there . And we are seeing this error on the account in cloud: Exchange: Failed to sync the ArchiveGuid 00000000-0000-0000-0000-000000000000 of mailbox 5*uu because one cloud archive 0136666666 already exists..;
I am writing here to confirm with you any update about this thread now. If this issue still exists, could you provide more detailed information to help us narrow down it?
Disabling an AD account does not result in deleting the corresponding Azure AD user or any associated mailbox. If that is your goal, you need to delete the on-premises account or move it out of scope of dirsync. Make sure to sort out any dirsync errors in the process.
Also, depending on whether a hold is active on the mailbox, the deletion might result in provisioning an Inactive mailbox instead.
I want to confirm with you how this mailbox was created and how do you disable it. I will try to reproduce this one in my lab.
Here is a related article which may be useful to you: Validation errors for a mailbox archive GUID for Microsoft 365 users
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