better would be to use LAN backhaul.
If not possible the channels must be the same on master and node, otherwise it cannot connect over WiFi. But this should be done from node itself, nothing you could do.
If it is shown paired in Aimesh then it will be on same channel.
Maybe your master router has 2x 5G bands in use and child takes one for Aimesh.
Does your DSL-AC68U even support ch. 149+ which you can see in standard router mode?
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