Roku will not recognize WiFi from Nighthawk M6 Pro

We just switched got a Nighthawk M6 Pro (mobile hotspot) to use for our internet and the Roku will not recognize or "find" the Wifi signal.  The Roku is fine with our Verizon Mifi hotspot.  But the Verizon Mifi has horrible signal/service so we switched to AT&T service with Nighthawk.

The Nighthawk M6 Pro is broadcasting in dual band - which includes 2.4 Ghz.  

I did a factory reset on the Roku and it still doesn't pick up the Nighthawk - only the Verizon Mifi device.

The Nighthawk is working fine with all the other devices in our home.  Only the Roku will not pick up the signal of the Nighthawk.

Any suggestions?