Nighthawk AX4200 Galaxy Won't Connect 5 Ghz

[SteveMetz]

I just installed a Nighthawk AX4200 and updated to latest firmware. My Samsung Galaxy S21 will connect to the 2.4GHz band but not the 5GHz band. When I try to connect it just spins and times out. My iPad connects fine to the 5GHz band.

Thanks for any ideas.

[microchip8]

AX4200 is a speed, not a router model. Which router model do you have? Which firmware version (not "the latest" but a number). 

Have you tried non-DFS channels on the 5 GHz band?