MIDI configuration Mac OS 11

Hello,
I want to use Sonic Pi to control Dexed via MIDI, but I have a problem: I created an internal network with the MIDI Configuration application of Mac OS11: Dexed does not respond. I have inserted a MIDI monitor to check that Sonic Pi is transmitting the information and it is. I deduce that the problem does not come from Sonic Pi but from my MIDI configuration. I can’t find any detailed information on how the internal MIDI networks work, and as I’m not a computer specialist I’m stuck…

Does anyone here have experience with the Sonic Pi in this configuration and have any ideas on how to solve my problem?

Thanks in advance.

I just tested sending a message from another mac and it works! But internally: nothing…

Eureka!
You had to check “Device is online” in IAC Driver properties…
Sorry for the inconvenience, maybe it will be useful to someone one of these days…