Hit by "401 Unauthorized" during PST imports? This showstopper often stems from expired credentials or missing permissions. Renew expired SAS tokens, assign the Mailbox Import Export role in Exchange Online, and configure MFA exclusions.
https://joripress.com/how-...
https://joripress.com/how-...
How to Fix ‘Unauthorised Error 401’ When Importing PST to Office 365? - JoriPress
This critical Office 365 roadblock halts migrations cold, usually due to expired credentials, missing roles, or MFA conflicts.
https://joripress.com/how-to-fix-unauthorised-error-401-when-importing-pst-to-office-365
06:45 AM - Jul 25, 2025 (UTC)
