Upgrade GL-E750 Mudi(v2) with RM520N-GL

Swapped out the M.2 card with a RM520N-GL. Using known good Google Fi Data SIM. Says "SIM Not Registered".

Driver issue? bad board? everything I was reading said it should be a simple swap and go.

Will this sim card be recognized on the E750V2 before replacement?
The E750V2 uses a usb port, and using RM520 does not improve the speed

Try entering the command at+cfun=1 ehen the modem is detected and there will be an inscription that the SIM card is not registered