Nighthawk MR5100 No AT&T 5G

I recently purchased a Nighthawk 5G Mobile Hotspot Pro.  I am unable to connect to AT&T 5G cellular network, only able to connect to 5GE.  New 5G SIM card from AT&T.  Updated firmware to latest version. Signal is 5bars.  I get 5G on my cellphone.  Tech support calls with AT&T and Netgear did not result in a solution.  According to AT&T there is no problem with towers or signal.   APN is "broadband". Could there be an APN setting that needs to be changed?

Asking the forum for assistance.  

Any input is greatly appreciated.

Blanca_O 

steadilife 

nazoren