I have a Ubiquiti WAP-AC-AP-Pro, kind of a "prosumer" WAP. I've not had any issues with any other devices connecting.
I was able to add another "network" to my WAP with WEP security and the station was able to see and connect to that. I did update both the unit firmware and the wifi firmware once I created the 2nd network. Hate to have a lousy security WEP network running, but it's segmented from everything else, and I suppose if I learn how, I can make it so that only communication can occur between my device and wunderground and ambientweather.
So on my normal wireless network, I have WPA Personal, and I had "WPA2 Only", but I tried the setting for "Both WPA1 and WPA2" but that was no help. I fiddled with several other settings as well, it won't show...