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Posted by: Lemonde - 07 May 2020 22:55:40
error No active public folder mailboxes were found for organization org.onmicrosoft.com. This happens when no public folder mailboxes are provisioned or they are provisioned in 'HoldForMigration' mode. If you're not currently performing a migration, create a public folder mailbox.

Posted by: Lemonde - 07 May 2020 23:05:58
We had forgotten to add the public folder mailbox Oops :(