RT-AC5300 Not Connecting To Smart Devices On 2G

2g Wifi wont connect Smart home devices that require set up on 2g only, Ring Door Bell, Ring Chimes, Orbit b-Hyve and others.
The devices will not connect to my 2g wifi, talked to Asus support twice, they could not fix the problem.
Asus solution to the problem was return it, its not defective but will not work with smart devices.
I have a Asus the RT-AC87R that does work, had both running side by side with Asus support on the phone, but no fix was found they them.
Feed back appreciate

Thanks