Thank you for the reply, Nicolas. False alarm. The keyboard is now working, but the pogo connector between keyboard and tablet is very temperamental. It takes a few reconnections for both trackpad and keyboard to work.
For now, I don’t think anymore that this is a driver issue.
I used a free Windows program that I downloaded from filehippo.com, a reputable download site. I think the program I used was “Driver Booster.” There are several similar programs available on the website.