Open an unrelated site first. If many sites fail, inspect your connection. If only one service fails, try another page, browser, device, or network if available. Note whether the failure is limited to your account or to one feature.
Check the service's official status page and community reports for the same time and region. A cluster of reports supports a broader outage, but reports alone do not prove the cause. Avoid repeated sign-in or purchase attempts while the result of a previous action is uncertain.
When you ask for help, report the tests you ran and the visible error without including private account details.