Error: AADSTS700003 – Device object was not found in the tenant

This error occurs when the device originally used for delegated admin access has been deleted from your directory.

Cause: If the Azure AD device associated with your delegated admin account is removed, the token chain breaks and access fails.

Resolution

Grant partner center consent again using your admin account:

1. Log into Sync 365
2. Go to Company → Delegated admin tab
3. Note the currently used account (do not delete it)
4. Click Add → Grant partner center consent
5. Login using the delegated admin account that’s active in Sync 365
6. Ensure you’re prompted for MFA during login — required for Partner Center access
7. Once complete, the token will be refreshed and the issue resolved