Start with the right checks.
A familiar sign in screen can change after an update or account switch. Before resetting anything, identify the selected account and whether Windows expects a PIN or a password.
What to do next.
Check the account name on the screen, keyboard language and Caps Lock.
Use Sign in options to see which methods are available. Choose a method you have actually configured.
For a personal Microsoft account problem, use the provider’s official recovery route on another trusted device.
For a work or school account, contact the responsible administrator instead of creating a replacement personal account.
Check the result.
After signing in, confirm that your expected desktop and documents are present. Resolve recovery information while access works, without removing your only working method.
Stop and get help if…
You see an unfamiliar account, repeated unexpected recovery prompts or signs that credentials were changed without your permission. Preserve the message and get help before continuing attempts that may prolong a lockout.