I'm using ProtonVPN with NextDNS without any issues.

How did u set up the DNS like I don't understand what I'm doing wrong

E24 It says " network has no access, private DNS server could not he accessed"

I did observe something like this, both on GrapheneOS and on stock, with other Private DNS (AdGuard's public DoT, Control-D...). All works well, and at some point I would receive a system notification about having lost Internet connectivity, and the Private DNS provider could not be reached. It would not happen outside of my home/when I was only using mobile data. I did not use a VPN.

I found out that on my home router, I had set up all DNS queries to be redirected to another provider (can't remember if it was AdGuard or else). Once I removed that from my setup, I ceased having connectivity issues. Maybe there is some kind of race condition when hopping with 2 different providers? I don't know...

      PS_Alex I thought I removed age guard, which is what I uses earlier, how can I chck to be sure