Going to laugh myself out of the room here: I was trying to run the enterprise version of 4.x and it was failing silently. Even running 3.x was failing silently.
I was trying to run it because I copied the first command I saw on the releases page, and it wasn’t clear that it was the enterprise version from the file name, because like most people, I just skim things.
Can I recommend changing the formatting of the file names so that it’s clear when there’s an enterprise version being installed, instead of defaulting to the enterprise file name? Instead of mattermost-4.9.0-linux-amd64.tar.gz being enterprise, can mattermost-enterprise-4.9.0-linux-amd64.tar.gz be enterprise, and mattermost-4.9.0-linux-amd64.tar.gz be team?
I ended up just reverting to 3.5 for the time being.