Hi TKB750,
Welcome to Sony Community!
We're sorry for the inconvenience. You mentioned that the issue starts when you finally logged in to your computer. So meaning typing your log in password is not an issue. This could mean that an application or software maybe causing your keyboard not to work.
Kindly follow the steps in the link below,
Make sure also that all the updates are installed. Here is the link to check the compatible drivers for Windows 10.
You need to isolate the issue to know what causing it. I hope this helps.
Regards,
Jen
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