I have an RT-AX88U as my primary router and an RT-AX58U as my media bridge; both are running the latest Merlin firmware (384.17). While the clients connect fine, they do not appear on the RT-AX88U's "client list" which makes port forwarding and other things annoying.
Previously, I used an RT-AC87U as the media bridge and had the same problem, but I assumed it was simply because the RT-AC87U was old.
Interestingly, if I use my really old RT-N66U with the legacy firmware (380.70_0) as the media bridge, it (the N66U) and the connected clients appear on the "client list" of the RT-AX88U along with their respective IPs and MACs.
Previously, I used an RT-AC87U as the media bridge and had the same problem, but I assumed it was simply because the RT-AC87U was old.
Interestingly, if I use my really old RT-N66U with the legacy firmware (380.70_0) as the media bridge, it (the N66U) and the connected clients appear on the "client list" of the RT-AX88U along with their respective IPs and MACs.