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troubleshooting Question

Exchange Online user with Office 365 cannot send mail as only on behalf

Avatar of bergquistcompany
bergquistcompany asked on
Microsoft OfficeExchangeMicrosoft 365
8 Comments1 Solution3566 ViewsLast Modified:
We are new to Exchange Online/Office 365 and I have a user who used to be able to send email as a secondary mailbox they had access to in their Outlook and now it shows up as send on behalf.  How can this be set back?