Welcome Caya WIlliams,
I understand how frustrating this is, especially when this is the only laptop you can use. Since you cannot sign in with your PIN, let's first try resetting the PIN from the sign-in screen.
- On the sign-in screen, make sure the laptop is connected to Wi‑Fi by selecting the network icon in the lower-right corner.
- Select "I forgot my PIN" below the PIN entry box.
- Enter the password for your Microsoft account when prompted. If you do not remember it, use another device to reset it at https://account.live.com/password/reset.
- After verification, follow the prompts to create a new PIN and then try signing in.
If "I forgot my PIN" is not available, select "Sign-in options" and check whether a password sign-in option (key icon) appears.
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