I can't activate my gateway because every time I log into the app, there is no account to select.

I have been trying all morning to try to access my account to set up my internet. Every time I log in via browser, I get an error message that says "The page did not load correctly" which then sends me back to the log in screen. When I tried to log in on the Xfinity app, I successfully logged in, but when prompted to select an account, there was only a continue button and no account to select. Pressing the continue button only takes me to the same screen. I only have access to mobile data, and any robotic customer support has not taken me to the proper place to troubleshoot this issue.