This can’t be saying that if you want to change your SSID and key you need to put in a helpdesk ticket. That’s insane.

ChatGPT answer.

Never heard of an ISP doing this. Crazy

This is bullshit.

An ISP may want to control the modem, so you might have to phone them up to have them remotely put a unified model into bridged mode to turn off the router functionality. But there should be no opposition to having bridged mode turned on such that a user could add their own router behind it.