I am testing out deleting and restoring a single email in my Exchange Online mailbox using V365 restore with modern authentication. I keep receiving an error of ‘failed to open mailbox, account doesn’t have permission to impersonate requester.’
I found that adding the Impersonation role in exchange is depreciated, so instead I installed Exchange Online Powershell, connected to ExchangeOnline, and granted my 365 admin account full access to my mailbox and I can now see my 365 account as a full delegate in my mailbox settings. I did this because my 365 account was not an option when adding delegate through EAC, I assume because it has no Office license or mailbox so it is not in the list of users to add as delegate.
However, even though I can now see my 365 account has full access to mailbox, I continue to get error when going through restore wizard and entering my credentials and 2FA code.
Is there anything more I need to do or am missing about granting my 365 admin account access to user mailboxes? Thanks!
