5G Wifi not showing in available networks.

I have had a Ring Video doorbell 3 for sometime now, It says it is dual wifi, 2.5 and 5G. But it never shows 5G as an available network. Today I installed 5 x Ring Outdoor Camera plus cameras with 2K vision. Again none with show 5G network. I run an Asus AX6000 router. FTTP NBN with 1000DL and 100UL. Everything else in my house finds 5G network no problem. Phones, TV, Laptops etc. What is the issue here, it's only the Ring device that won't see 5G network. All run fine on 2.4. But want 5G connection. Looking forward to some answers.Cheers Mario