Hi, Dylan. I'm Robinson, and Iβm happy to help you today.
The password for your user profile is the same password that you use to access your Microsoft account. Renaming the NGC folder using the command prompt should remove all PIN settings and fix the problem.
1-Restart your computer while holding the SHIFT button
2-The Advanced Startup menu will open on the boot.
3-Go to Troubleshoot.
4-Now, go to Advanced Options >Command prompt
5-Run this command to take ownership of the folder:
icacls C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\Ngc /T /Q /C /RESET
6-Run this command to rename the folder:
Ren C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\Ngc Ngc.old
7-When finished close the command prompt then click to return to the first screen
8-Click to continue to normal boot
9-Then you should be able to sign in on Windows using your Microsoft account password.
I hope this information helps. If you have any questions, please let me know and I'll be glad to assist you further.