Xfinity app won’t let me log in

Hello, I am having trouble logging into the app to manage my WiFi service. I am able to log into my account when using a mobile browser, but after entering my email or phone number on the app, I get an error message that says “access denied,” so I never get to the password or 2FA page. I have tried deleting and reinstalling the app, restarting my phone, restarting the WiFi router, using mobile data, and I have double checked that my credentials are correct. I also checked to make sure the app was up to date. Why am I getting the access denied message?