Access denied to XFi app

I have an xfinity wireless gateway that Comcast had to come and install because I couldn’t get into the xfi app myself on my iPhone. I can login on the My Account app, and on a browser, but it redirects me to the xFi app I login successfully but get an error saying “Access not authorized. You have signed in successfully but you must be an Xfinity user to enjoy this service.” I AM and xfinity user, there is no one else tied to my account, only my one email address/login, and I can login to my account so I’m clearly an xfinity user. I’ve deleted the app and reinstalled, and also cleared my browsing and cache from safari as other posts suggest. HELP!