Unable to install Apps from the App Store, pop-up window with no options other than cancel

I search for an app (any app available in the app store), click Get, then install. A popup with no options or prompts and nothing happens. Tried signing in and out, change password requirements, date and time settings, scanning my finger even though it doesn't ask for it and rebooting. Click "Get" Click "Install" Popup, with no options other than cancel. At this point it will sit at this popup forever if I let it, never installing. At the same time, previously installed applications are being updated successfully. MacBook Air MacOS 15.4