Identity mismatch
Check whether an email or username is expected. Autofill may belong to another account.
Separate the address, identity and error type when login fails. Password checks and account recovery serve different purposes. Reading this explanation requires no login.

The distinctions below help explain this subject. Consider the conditions alongside the situation.
Check whether an email or username is expected. Autofill may belong to another account.
Use trusted recovery. Repeated guesses may cause a temporary restriction.
Isolate network and browser issues before changing a password.
Avoid entering details at unexpected destinations.
Check keyboard language, case and spaces.
Distinguish invalid details, waiting instructions and locks.
Use the service's own recovery or support route.
Closing a browser does not necessarily sign you out. A saved session can preserve access. Use the service's logout control on shared devices.
Check the domain in your password manager's record. Unexpected autofill failure may indicate a different address. Read the full spelling yourself as well.
This site provides no operational account login form. Do not enter another service's credentials here. Access accounts through that service's verified route.
Save the new password after trusted recovery. Review unfamiliar sessions where available. Replace reused credentials on other sites too.
Avoid rushing to links in unexpected code or change messages. Open the verified service yourself. Retain the time and sender details of suspicious messages.
No; move to recovery after deliberate checks.
No. Session expiry requires renewed authentication.
No. Do not share codes even with someone claiming to be support.
It can isolate display issues, not fix credentials or account locks.