Cannot open mailbox /o=First Organization /ou=Exchange Administrative Group – How to Fix the Error?

Many Exchange administrators face this issue when they migrate from a relatively older Exchange version to a modern version of Exchange. For example, from Exchange 2007 to Exchange 2013 or from Exchange 2010 to Exchange 2016. Also, this error is reported when administrators go to the Add-in section in the Exchange admin center (especially in…

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