Quectel RM502Q-AE 5G on ATT Firstnet

Trying to get this modem to provision on ATT but they are saying IMEI not supported. I know it can be done but don’t know how if anyone can help. Thanks

Anyone? Do i need a newer firmware?

Anyone know how to setup IP passthrough? I got it to connect to internet but now it won’t provide internet to my unifi UDM PRO. Guessing it is a double NAT since no passthrough is set?

Do any of the quectel modems support band 14 5g firstnet?