I just went into my phone and blasted Chrome… stopped the app, cleared the cache, then down and removed all stored data, site stores, etc., things that apparently the regular on-menu clear of private data doesn’t.
I can now see the site contents in Chrome. Working on Brave…
EDIT: OK, I was a little more deliberate with Brave. Went in to Settings > Apps, force-stopped the app, cleared cache. Then tried to load the community site again, still blank.
Back to Settings > Apps > Brave on the phone, force stop again, clear cache again, then into Manage Storage… “Clear All Data”. Back out and open Brave, clear through the new install/welcome stuff, and there it is, the community site displays! And correct certificate.
OK. So apparently there’s some deep caching that goes beyond what “Clear Private Data” normally reaches, and even the usually-aggressive “Clear Cache” on the app doesn’t get. WTF.
Edit 2: I also had to do the same on the Discourse app itself. I could go in to either browser directly and see the site, but if I launched the site from the Discourse app, I got the same blank page. After force stopping the app, clearing cache, and clearing all data, I was able to re-register the site with app, re-enter my credentials, and see the site.
If that’s all certificate-related, I hope it goes better on the next renewal. I use LE certs a lot myself, and never have trouble like this, so hopefully it’s just teething pains–it looks like you transitioned from GoDaddy to LE? (good move)