Identify the failing layer
Authorization, property selection, provider availability, import, and display are different stages. A green authorization can still point to the wrong property, while a healthy property can have no records in the selected date range.
Read the diagnostic details
Check selected account, property, last successful sync, attempted refresh, record coverage, and the visible provider message. Save a screenshot only after these fields are visible.
Reconnect the smallest scope
Refresh or reconnect only the affected customer connection. Confirm that other identities and imported history remain intact. After reconnection, verify the exact property and run a controlled refresh.