so some apps (like Firefox) with internal hard-coded DNS functions Thank you! This was the information I needed! It landed me on this page support.mozilla.org/…/firefox-dns-over-https which shows When DoH is enabled, Firefox by default directs DoH queries to DNS servers that are operated by a trusted partner, which has the ability to see users’ queries and lead me to this page wiki.mozilla.org/Trusted_Recursive_Resolver where I was able to read more about it. That explains why it does not work, I appreciate the insight!