I have an EAP245.  I recently added a EAP225.    Right now they are entirely seperate.    No controller.

I use dnsmasq as my local DNS/DHCP server.    Both EAP are setup to request an IP address via DHCP.     Dnsmasq issues the "DHCP response" and also assigns a local DNS name.

'tl-eap245' resolves to 192.168.3.2.  'tl-eap225' resolves to 192.168.3.3

If I try to open 'http://tl-eap245' in either Chrome or Firefox (Windows 11) I get "400 bad request".   I have to use "http://192.168.3.3".

My EAP-225 came shipped with EAP225(US)_V3_2.6.1  and I was able to use "http://tl-eap225" to open the admin page.  However after updating the firmware to  5.1.0 Build 20220926 it now also reports "400 bad request" if I try to use the DNS name.

Is the above the end-of-the world, no.  Clearly I can just use IP address but it's more convenient when I forget which EAP has which address if I can just use the DNS names.

Note this has nothing to do with the "tplinkeap.net" dynamic configuration domain, I am not using that.     I tried to ask the above Q to tech support but they just couldn't grasp the concept that I managed my own DNS and wanted me to send them screenshots of my DNS.  They kept referring to 'tplinkeap.net'.  In the end I gave up trying to resolve it via them.