Hi Donna. I'm Greg, an installation specialist and 9 year Windows MVP, here to help you.
See more about TPM troubleshooting or reset here:
https://docs.microsoft.com/en-us/windows/securi...
https://answers.microsoft.com/en-us/windows/for...
https://docs.microsoft.com/en-us/windows/securi...
You can also try resetting the PIN which may help. Remove the PIN in Settings > Accounts > Sign in Options, restart PC, then add it back.
If you cannot Add or Remove the PIN in Settings > Accounts > Sign in Options even after a restart, then unhide Hidden Files in File Explorer > View tab > Options > Folder and Search Options > View tab > tick box to Show hidden Files.
Browse to C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC
Delete or rename to NGC.old this folder to reset the PIN.
You may need to first take ownership of the folder: https://www.tenforums.com/tutorials/3841-add-ta...
Once you delete or rename the folder it will recreate it so you can add a PIN normally in Sign-In Options. You may need to restart the PC first.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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