Adobe Acrobat Standard DC infinite loading when signing in

I'm having issues signing in to the Adobe PDF reader app. See screenshots below. It just says loading indefinitely in the sign-in app (which is a separate application). And whenever I open up a PDF this separate app auto-opens and wants me to sign in. But that's not working. I don't have a Creative Cloud app on my computer - I only use the Adobe Acrobat Standard DC app.