@CoKro There are a lot of errors and problems with DHCP on TP-Link routers, look at this post. https://community.tp-link.com/en/business/forum/topic/581548

@Spryde I'm not going to comment on UniFi support because I've never needed to use them despite the fact that I have 50-60 UniFi sites, it just works with little problems. Maybe the long wait for...

@NicholasA I get it, I have to scan for new software, but unfortunately SHA2 does not work on this update either, The configuration is there but it doesn't work.. Ok I hope mDNS work for you :-)

@NicholasA Hmm strange, I don't,, ok I have to wait and see :-) thanks for information.

@NicholasA Where do you get 7206 firmware (v1.2.3)? I find only 1.2.1 https://www.tp-link.com/us/support/download/er7206/v1/#Firmware

@CoKro yes, it seems quite strange, I've used pi-hole here without problems, but I don't have EAP225, but there could be something with these access points that causes problems, you can hope that...