Thought my access control rules were too tight, but just realized I have no 2,4Ghz network available. ER8411 router, OC300 controller, SX3206 switch feeding power to the EAP690E HD.

All the default bands are selected, 6Ghz, 5Ghz and 2,4Ghz. Confirmed by disabling 6Ghz and 5Ghz, no device in the network sees these affected SSID:s when only 2,4Ghz is active. 
 

Almost all of my IoT devices are without network currently :(.