Try using the private IP options instead and see if that works. The generic one being 10.64.0.1, but other options that include ad voicing and such ranging from 100.64.0.1 to 100.64.0.25 or something like that. I’ve got my entire network setup behind their VPN and a a pihole pointing to one of their private DNS addresses without any issues. I left their pubic DNS years ago so that I could make sure my DNS requests were always within the tunnel instead
Unless it’s my cat. Got heavily filtered water and use it to fill 3 different fountain bowls in different parts of the house (none near the food source, but I did that because if they are, she’ll eat her food over them…) and the cat still demands I turn the sink on instead. Same exact water, and even though I change her water out almost every other day, the sink wins. Just glad she hasn’t figured out how to turn it on yet…
Funny enough the last fountain I got looks like a faucet and she’s like “nah I’m not stupid, turn the sink on.”