To change your Windows Hello PIN:
Press the windows key or go to the search bar and type "sign in options"
And open the Sign-in options setting
IF YOU REMEMBER YOUR PIN (steps for if you've forgotten below)
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Click the PIN (Windows Hello) option and press change PIN
Then enter your old PIN followed by your new PIN
Make sure to tick the Include letters and symbols option if your PIN includes those
IF YOU DO NOT REMEMBER YOUR PIN
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Ensure that you have your MFA device with you (Phone)
After clicking the PIN (Windows Hello) option
Select forgot my PIN
And Press Continue
Then enter the MFA number into your Authenticator app on your phone
Then Enter your new PIN twice
Make sure to tick the Include letters and symbols option if your PIN includes those