Using the Exchange Admin Center or PowerShell, I’d assign permissions like “Full Access,” “Send As,” or “Send on Behalf” to the appropriate users or groups, ensuring they have the necessary access to shared or individual mailboxes.

Common issues include sync errors, missing files, and storage limit warnings. To resolve these, I’d check the OneDrive sync status, ensure the user is signed in with the correct account, verify file permissions, and check available storage.