I have a cloned key from a spare modem that I use with my router (Unifi) to allow it to connect directly to the ONT, minimizing devices in my rack.

I’ve found that this usually confuses first line support enough that they’ll listen to me if I need them to do some specific action.

To be clear, I’m not stealing internet access or anything of the sort. I didn’t want a useless modem / AP that I’d end up bridging anyway, so I extracted a key from another one, and my router uses it to auth with my ISP.

It quickly becomes the Service Animal problem. When no one can or is allowed to verify your infosec credentials, everyone becomes a three star infosec General with a simple purchase from Amazon/Alibaba.