This isn't going to help you but I'm having the same issue with an IOT device (Fitbit Aria). Cannot get it to connect regardless of what I try.

I'm running the Omada Software Controller on a Synology DS920+ that's hardwired to the EAP235-Wall mentioned. The Office AP is then wired to port 2 of the TL-SG2008P. The software controller isn't...