Hello shawie,
The PIN prompt is most likely coming from Windows Hello or a passkey request, rather than the Microsoft account password itself. Changing the Microsoft account password will not change the Windows Hello PIN because they are separate sign-in methods.
Here are some suggestions you can try:
- Since too many attempts have been made, stop entering PINs and wait until the temporary restriction clears.
- On the sign-in page, select Other ways to sign in, Sign-in options, or Use your password, then enter the new Microsoft account password. If a Windows Security box appears asking for a PIN, cancel it first, as the browser may be trying to use a saved passkey. If the password option is not shown, try signing in from a private browser window or another device. This may prevent the saved passkey prompt from being selected automatically.
- If the PIN appears only when the browser fills a saved password, check the browser’s Password Manager settings and turn off Windows Hello verification for autofill.
For example, on Edge go to edge://settings/autofill/passwords/settings then under Autofill passwords and passkeys, select Fill website password and sign in automatically, or suggest available passkeys.
In Chrome, it's chrome://password-manager/settings > Turn off Use Windows Hello when filling passwords.
- If she wants to reset the device PIN, sign in to Windows with her password, then open Settings > Accounts > Sign-in options > PIN (Windows Hello) > I forgot my PIN and complete the verification steps.
Please let me know how it goes after trying these steps, and I'll be glad to continue looking into it with you.