Can't install apps from App Store after updating to Sequoia 15.5

I recently updated to Sequoia 15.5 on my Macbook Air M1 and now I can't install apps from the App Store. When I press Get, then Install, a popup window comes up showing the app info, but the only option at that point is to press Cancel. It used to ask for my fingerprint to install the app. If I don't press Cancel, the popup stays forever and the app is not installed. Trying my fingerprint doesn't help either.

This is a typical window I see:

Is this a Sequoia bug or has anyone else seen it? Am I just out of luck for installing new apps on my Mac? That seems very limiting. Any suggestions would be appreciated, thanks.

[Edited by Moderator]