Regarding the Let’s Encrypt, this is a very common issue when someone tries to emit too many certificates in a short burst. Won’t ever affect people who do the install via the easy path in a single stroke, but it is a recurrent issue affecting people who do many installs while testing stuff.
My plan is to move us away from acme.sh very soon into nginx native acme support, which should make it easier to surface this issue.
That’s blocked on Update to trixie - Pull Request #1048 - discourse/discourse_docker - GitHub