I do not think this will work between different wlan group. There were also previous issues with guest networks and WLAN groups. had to re-authenticate when roam from one wlan group to another. I had...

try 0.0.0.0 / 0 0.0.0.0/32 only block 0.0.0.0 and not many use that :-)

I have a question regarding the Omada SDN Switch. is there support for Fallback VLAN on 802.11x ports? unauthorized devices are automatically routed to a guest vlan for example?

@Daniel_NL What type of power do you use? If you use USB Power with to smaal power strange problem cant occure, Power with POE if posible....

If you have enabeled Airtime Fairness try to disable. many devices behave strangely when this feature is on.

@citystore Yes if you upgrade to OC200(UN)_v1_1.7.0 Build 20200703 https://www.tp-link.com/en/support/download/oc200/#Firmware /shberge