Hello,
The first issue you're describing with the missing pin input is a known issue with windows 11, it's there, it's just invisible, the workaround is to click where you expect it to be and type the PIN as normal (ridiculous i know).
For the second issue i recommend performing a corrupt file search and repair.
Open Start, type: CMD
Right click CMD
Click Run as administrator
Type in at the prompt OR Copy and Paste these one at a time : (Hit enter after each)
Dism /Online /Cleanup-Image /CheckHealth
Dism /Online /Cleanup-Image /ScanHealth
Dism /Online /Cleanup-Image /RestoreHealth
Also run the System File Checker utility:
Open Start, type: CMD
Right click CMD
Click Run as administrator
At the Command Prompt, type: sfc /SCANNOW
This will check for any integrity violations
Hope this helps,
JC