New GT-AC2900 won't join AiMesh as a node

[AlphaGator]

I have an RT-AC5300 as the AiMesh Router and tried setting up the GT-AC2900 as a node, but it keeps failing. I then setup the AC2900 as a normal router and checked for a firmware upgrade (since it is new out of the box) and it said that it is up to date.

Any suggestions?

 

[Grisu]

make a factory reset, dont change anything, power on and try again on main-router to join it.
Also try both ways Wifi nearby and master-LAN to node-WAN.
Enable WPS on master router.

 

[AlphaGator]

This is resolved. For some reason, my AC5300 firmware wasn't current and when I tried to check for new firmware on the web interface it kept saying it couldn't connect. So I tried the app and it was able to do the f/w upgrade. It paired after updating the main router.