Reconnecting Gmail mailboxes after a Google Workspace migration

When your organization migrates to a new Google Workspace instance or transfers a domain between Workspace accounts, Google invalidates the existing OAuth tokens that Unify uses to connect to your mailboxes. This means your previously connected mailboxes will stop working, and re-authenticating from the existing mailbox settings won't fix it — the old OAuth grant no longer exists in Google's system.

How to fix it

Rather than deleting your disconnected mailbox (which would permanently remove all associated data), use the "Add New Mailbox" flow with the same email address:

1. Go to your mailbox settings

2. Click Add New Mailbox

3. Authenticate with the same email address as your disconnected mailbox

4. Complete the Google authentication flow

Unify will recognize that this email is already associated with an existing mailbox and will replace the broken connection with the new one — no data is lost.

Why "Add New" instead of delete and re-add?

Deleting a mailbox is permanent. You'd lose all associated tasks, play enrollments, sequence history, and mailbox settings. The "Add New Mailbox" method swaps out the underlying authentication while preserving everything tied to that mailbox.

When this applies

This solution is specifically for connection failures caused by Google Workspace changes — domain transfers, instance migrations, or bulk OAuth revocations. If your mailbox disconnected for a different reason (e.g., password change or permission revocation), try re-authenticating from the existing mailbox settings first.