Integration sync failed
Updated Mar 22, 2026 · 3 min read
When mailboxes do not appear in your sending tool, here is the fix.
On this page · 3
- 1. Wrong API key scope
- 2. Workspace mismatch
- 3. No live mailboxes yet
If you connected an integration and mailboxes never appeared in the destination tool, the cause is almost always one of three things.
1. Wrong API key scope
The destination tool's API key may not have email-account write scope. Check the destination tool's settings and regenerate with the correct scope.
2. Workspace mismatch
Some sending tools have multiple workspaces under one account. Confirm the API key was generated in the workspace where you expect mailboxes to land.
3. No live mailboxes yet
Inboxlee only syncs live mailboxes - mailboxes still warming up via DNS verification do not sync until they go live. Wait for the live state, or click Resync after the mailbox is live.