Hi,
What's the make and model of the keyboard you use?
If you already have it and the issue remains, here are a few things you can try:
-Boot into Safe Mode and test the keyboard there.
-Try a different physical keyboard to rule out hardware issues.
-Use the On-Screen Keyboard for now, as you’re doing.
-Check for any active accessibility features like Sticky Keys or Filter Keys.
-Look into any third-party software that might be interfering with input.
If none of these help, you might want to temporarily roll back to version 24H2 until Microsoft releases a proper fix.
You may also try the workaround here - https://www.reddit.com/r/techsupport/comments/1kh91oe/keyboard_not_working_after_windows_update_fix/
This is a non Microsoft website.
Let me know which worked for you.