Today I was working on a Cross Tenant Mailbox Migration and kept running into issues with mailboxes being quarantined due to an PropTagToPropertyDefinitionConversionException. I stumbled across this blogpost which helped me out:
Here’s the short of it (translated from German to English):
Several blog entries state that Microsoft Support must be contacted for the solution… this info is wrong. The following commands can be executed yourself to resolve the issue:
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