Save the service and feature affected, the approximate time with time zone, the exact visible error, and the steps that led to it. Note whether the issue occurs on another browser, device, or network and whether other parts of the service still work.
Capture a screenshot only after hiding private messages, account details, payment information, and session links. Check the service's official status and recent community reports, but do not treat either as proof of the cause. Use the official support channel for any account-specific diagnostics.
A short timeline is often more valuable than a large unfiltered log.