New Router, Updated Pi-hole, now if I set it as DNS server I can't connect to internet on any device

Recently our router broke, so we replaced it with one that is the same model.
I went through setting up the new router, returned the wifi name and password to what we had before and then wanted to get the pi-hole running again.

The pi-hole's IP is the same as before

I can access the web interface (though only using the IP, not via pi.hole)

On the web interface, I updated everything that had an update open

For some reason the router is an hour behind in it's system time. No idea if that's relevant.

Expected Behaviour:

Setting the pi-hole's IP as (only) DNS server in the routers settings lets it do it's duties, just as it did before we got the new router (which is the exact same model as the old router)

Actual Behaviour:

When I set the custom DNS server to the pi-hole's IP in the router settings I no longer can access the internet on any device.

Debug Token:

https://tricorder.pi-hole.net/5wAF2K3L/

please help and thanks