While creating or modifying Room mailboxes with Resource In Policy Request/Resource Out Policy Request, you get these errors: 'The values is already present in the collection' or ' The parameter 'legacyExchangeDN must be a non-empty string'.
Possible Reason:
These errors would occur if the mailboxes selected for the Resource In Policy Request/Resource Out Policy Request policies are legacy mailboxes.
Solution:
Please remove legacy mailboxes from the selected list, and perform the operation again.
Please refer to the screenshot attached below.
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