Last piece as a follow-on from previous append at #238 was to enable AiMesh. The setting was as per this pic on the GT-AXE11000 AiMesh panel for Ethernet.
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...but none of the wireless mesh units (2nd AXE11000 & AX88U) would connect after I did a WPS button hold down and power up while holding down the WPS button. All units 386.5 Beta1. Discovered only ethernet connected units would connect to the AXE11000 Router in AiMesh mode. This was not the case with the same units (2nd AXE11000, AX88U) with the AX88U I had removed for the AXE11000.
I had to run a ethernet cable to the WAN port of wireless units (2nd AXE1100 & AX88U) from the AXE11000 router, establish the AiMesh. Once in AiMesh mode then I could remove the ethernet cable, and these units would keep working in wireless AIMesh mode.
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