djay tries to match the MIDI input and output port using the port name. They either need to be the same or have the same prefix or suffix. If it doesn’t find an output port, the MIDI Out options are greyed out.
Can you change the port names to remove the “0” at the end (e.g. “Daemon Input” instead of “Daemon Input 0”)?
Checking with the developers it seems that the common prefix/suffix currently needs to be at least half as long as the device name, which is why the detection fails here.
I have forwarded the request internally to improve this. I’m sorry it seems that at this point we can’t help you from our side.