I had to switch services -- from fios to this awful in-home 5G setup -- and instead of just adding a service to my preexisting account, they had to make a whole new one! then the app stayed signed into my old account, so the setup process just yielded an error page over and over. it was infuriating
May I recommend a DFRobot dual gigabit Ethernet carrier board, a Raspberry Pi Compute Module 4 (with WiFi if you need that) and a copy of OpenWRT. It is hands down the best Internet gateway device I've ever used.