Something here may help.
https://support.microsoft.com/en-us/windows/reset-your-windows-10-local-account-password-86912508-e584-37cc-86eb-6e9b0542b5ba
--please don't forget to Accept as answer if the reply is helpful--
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So I Was Doing School And My Schoology Crashed. I Refreshed And It Told Me To Sign In. And Then I Got A Notification About My Windows Account. I Tried Signing In To Schoology First. Heres What It Said. Request Id: 687df152-5474-4f54-8fdb-2e3775e89f00
Correlation Id: 0d3b8881-95ba-4677-adc8-331cd5a8b7e5
Timestamp: 2021-01-11T15:27:59Z
Message: AADSTS900561: The endpoint only accepts POST requests. Received a GET request.
Being Unable To Contact My Administrator, Because I Don't Have Access To Any Email Sources, I Started To Panic. My Computer Died. I Put It On The Charger, And Turned It Back On. I Tried Logging Into Windows, And Every Time It Would Say My Password Was Incorrect. Is There Any Way To Fix This? (Note: I Am Using My Mom's Computer)
Something here may help.
https://support.microsoft.com/en-us/windows/reset-your-windows-10-local-account-password-86912508-e584-37cc-86eb-6e9b0542b5ba
--please don't forget to Accept as answer if the reply is helpful--
Do you have any other administrator account in your device?
If not, you will need to ask administrator to reset your account and then you may sign in and switch to different account.
If you cannot login system, you need another admin account for login then change original account's password, if you don't have, password cannot be changed. Try your mother's account to do the operation.
On the other hand, if you have a Microsoft account for login, go here to check your Microsoft account information, you can change password online.
https://account.microsoft.com/
Finally, if all methods no help, you need to reinstall system
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