A root access point is joined. A mesh access point at the far end of a stadium hears that root only weakly, and the backhaul never stays up. What is too weak?
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Short Explanation
The root is on the network, and the far mesh radio can barely hear it. Your backhaul signal is too weak to stay up. A guest password does not carry that link.
Full Explanation
A mesh access point joins through the backhaul to a root. This root is already joined, and the far mesh access point hears it only weakly, so the backhaul never stays up. The weak piece is that backhaul signal. A guest passphrase is not the signal a backhaul uses. The client SSID beacon is for clients. Making it weak does not stabilize a backhaul, and it is not what is failing here. A DHCP lease does not set a permitted signal level for mesh. A mesh access point hears the root too weakly to hold a backhaul. The root is joined. The backhaul signal is the problem. Check one live client after the change and leave the rest of the floor alone until that client matches the result you expected. Read the live counters after you retest. Exam caveat: a weak backhaul can be distance, an obstructed path, or a radio that is down in power. Measure the backhaul before you add another hop that would be even weaker. Operational check: improve the path or the placement until the mesh access point holds the backhaul, and confirm it stays joined.