I am attempting to edit a Room Resource Mailbox, and I'm getting an error that I can't seem to figure out how to correct. The error states "The value " is already present in the collection." I am unable to get passed this error in order to edit the settings of this mailbox. We're ultimately attempting to delete a recurring calendar item in order to recreate it with a different end date, but no one currently has rights to this mailbox to do it.
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