Hello, Welcome to Microsoft Community.
Thanks for your feedback, Based on your description, it sounds like you are having issues with the keyboard and fingerprint sensor.
From the symptoms you mentioned, it's very likely that you are experiencing a hardware problem with the keyboard itself. You can search for OSK, try to open the on-screen keyboard, and check if the arrow keys are working properly. If they are, then it means there is an issue with the keyboard itself.
As for the fingerprint sensor issue, please first go to the desktop, delete the fingerprints you have already recorded from the settings, and then re-register them to see if it works.
If none of the above solutions work, it's very likely that both of your devices have hardware issues. In this case, we suggest you contact the manufacturer of your laptop and ask them to provide warranty or repair services.
You can also try running the Windows Hardware and Devices troubleshooter to see if it can identify and fix any issues.
If these steps don't work, you may need to contact the manufacturer for further assistance. I hope this helps!