Same login shows different accounts on website and iPhone; cannot link accounts

I have two active Xfinity accounts at different addresses: my primary residence and a rental property. Using the exact same email address and password, the laptop website shows only the rental property, while the iPhone Xfinity app shows only my primary residence.

Neither device has a “Switch account” option. I have already signed out and back into the app, and the “Link accounts” utility fails.

Please help investigate the Xfinity ID associations for both accounts and why I cannot access both through the same login