Windows 11 KB5074105 or newer update already includes MIDI 2.0, which is still a preview release, so there may be errors. I experience that it does not recognize programs that load after the system starts or are started after it. Such as loopmidi, rtpmidi, or even A&H MIDI Control.
My easiest solution is to press “Restart MIDI Service” within “Global MIDI Settings” in Windows’ own “MIDI Settings” program, after you have started all programs, but before starting DAW.
Useful things:
MIDI Service Check-er:
This allows you to check whether your Windows update for MIDI 2.0 is already installed.
Windows.MIDI.Services.SDK:
This is the service itself, and the program I mentioned above.
(Downloads are in “Assets”)
Another alternative is to write a .bat file after installation in which you put this:
@echo off
midi service restart
And create a shortcut to this .bat that can be started with administrator privileges. This way you can even put this in the task scheduler, e.g. to run 2 minutes after login (presumably in less than 2 minutes all background programs will start automatically, e.g. A&H’s own MIDI Control).