IPv6 PD size?

I have fiber service with an IPv4 static block and a BGW320 - is there any way to get a /60 prefix passed through to my Ubiquiti hardware so it can delegate a /64 to the internal networks?

AT&T support is useless, they want me to reset my BGW320 WiFi as a troubleshooting step, but that’s obviously not gonna do anything.

Anyone got any contacts in support (or is one) that can even spell “IPv6”?