Also, depending on how the flake is setup, you might also have to add .#hostname, at least for the initial run. After that .# can evaluate which host is being rebuilt.
That feeling when you're cleaning your desk after a 17 day vacation, and decide to rearrange a few things, but it requires you to reroute power, so you just shut down your laptop and flip the power strip off... only to wonder later why your #selfhosted#mastodon server is offline, and then you realize, you also powered off your Mac Mini ESXi host earlier... ...And now we're back up. 🤣