I thought you said the Roku TV wasn't configured yet - I guess I misunderstood your issue again.
I misunderstand your goal, then.
Fix the interface DNS setting.
Excellent!
A dumb AP only has one interface (LAN). You assured us that your device was configured correctly. So, it's not clear how you can set "it" to "anything else" (also, it's not clear what "it" you're referring to).
It was getting its DHCP from openwrt but not tagged
there will not be any unconfigured devices, i meant so new devices can have a connection before being tagged
I had to add this interface because the other IP address’ were causing problems
The DNS interface I had to create contains all the IP address’ used for HDP, as with them on lan dnsmasq was listening on them all, I added an exclude for DNS interface to fix this
I seem to have created another problem, DHCP is not renewing for anything
We discussed adding other IPs to the single LAN interface. Now it seems you added a second interface to a Dumb AP and are experiencing issues.
Perhaps you should explain why you created a second interface. Maybe we can assist after understanding.
Exclude from what???
You mentioned that you used 192.168.0.0/16 as your subnet. I'm not sure why, and you never elaborated. Despite our discussion, you also insisted on using IPs in the 192.168.10.X range. Since it's not clear why, you'll need to elaborate now that you're experiencing issues.
We discussed fixing dnsmasq, instead you created a second interface and are asking a different series of questions about a config you just surprisingly made?
Since that's not how a Dumb AP is configured (which we discussed) and I'm not sure how you expect another interface to serve DHCP on LAN (and I'm not going to guess how you expect it to, or why you think it should work), I'll just let someone else try to follow this setup.
This is a screenshot of the 25.12.2 web GUI. Feel free to ask [detailed questions] if you need further assistance. I don't want to elaborate in case you already have the knowledge or if you've already made a drastic configuration change that makes this discussion/post irrelevant.
(I hope it's obvious that my screenshot just shows the default, as I don't have a Dumb AP that I'm attempting to setup multiple IPs on LAN for DoH proxies. You do.)