
ASUS RT-AC68U, AC1900 AiMesh

ASUS RT-AC68U, AC1900 AiMesh
Hello I have set up an Ai Mesh with 2x RT-AC88U (1x Prima & 1x Mesh) now I was able to buy a RT-AC68U at a good price and wanted to integrate it as a 2nd mesh device but the network does not find it. I have already carried out a reset and installed the latest firmware. I am at a bit of a loss can anyone help me or tell me what I am doing wrong?