Georgia State \ Unable to reach internet/can't resolve DNS

I have used 1.1.1.1 for over a year as my DNS resolver and have it set up on my Mac. Starting today I was unable to reach the internet at my school (Georgia State University, located in Atlanta, Ga). I got the error(s) shown below. I updated my browser, restarted and shut down my Mac to no avail.
I then reset my DNS settings and was able to reach the internet. Below is the Cloudflare help tool ran with the reset DNS settings. I could not run it with 1.1.1.1 settings. Also checked https://www.cloudflarestatus.com/ says everything is fine. Help?

Update: Downloaded the app (1.1.1.1) on my iPhone, internet works fine (connected to same wifi as Mac)

Try flushing your DNS cache.
lookupd –flushcache

It looks like 1.1.1.1 is being blocked for DNS. I would try using 8.8.8.8 or setting up DoH or DoT on your Mac.
Your iPhone works with the app because DNS in encrypted.