Tried connecting to 1dot1dot1dot1.Cloudflare-dns.com but Android settings returned “Could not connect”. OpenVPN seems to interfere with 1.1.1.1. Any ideas on a workaround? 
It’s probably your OpenVPN config. It’s the same for me. I am routing all my traffic through the tunnel and my server pushes two internal DNS servers (pi-hole) which are configured to send encrypted requests to Cloudflare so i never took care about the private DNS settings in Android.
Btw: did you know that you can shorten the DNS host? try one.one.one.one
Solved it, but had to stop using OpenVPN and instead configure the VPN in Android settings.
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