Hey Jeremy,
Sorry you're running into issues. Thank you for your patience waiting for a reply as I took the day off yesterday. MiniMeters is definitely supported on Win11 so I am sure we can figure out what is going on.
To double check, please reboot your PC if you haven't already. Some of the more common issues on Windows include using ASIO audio drivers which prevent MiniMeters from receiving audio when using Default Output Capture or one of the Output devices in the audio device menu. I would also suggest inserting the "MiniMeters - Audio Server" plug-in on your master channel in your DAW and selecting Audio Server from the audio source menu in MiniMeters.
I got your email as well and am sending a response there too. If you'd like to send screenshots of your setup or additional info that may be helpful.