How Do I Even Activate Internet Services?

This is so frustrating.

I login to the wifi login and password provided in my device. (device is connected)

It redirects me to a link that asks me to download the app.

I go to the app, sign in, and it says "Access not authorized".

How do I activate my internet now? I already had to take two trips to the xfinity store to resolve issues with my account (billing done but my account wasn't created, so I couldn't login back then).

Do I need to go to the store again for this?