Can't install apps after factory reset
Google Support had me try a number of things that didn't help, but when they had me remove my payment methods, that seemed to do it. I had already removed and added my Google accounts from my device, which I didn't think would help because it clearly wasn't a problem specific to my device. (I had realized I also couldn't install that game or other games I'd bought to my phone, a separate device, so it wasn't device-specific.) The last thing I did was remove my payment methods and cancel a subscription in Google Play, and then I could install my apps to my tablet and phone. I'm not sure how that fixed it, but it did. It seemed to "reset" my devices with Google Play, so to speak. If anyone knows how that resolved the issue, I'd love to hear. I'm glad it worked, but I don't know why it worked.