Lazy, I saw you pictures of the configuration of the keyboard and it is NOTHING like mine. I had asked you to attempt to reproduce my configuration. The reason why is because mine work perfect. I just tried to record midi from the keyborad and all worked as intended. I have two keyboards I (only 1 is presently on, so you do not see the other in my picture. If I set my configure similar to yours I get nothing! I would be glad to show you via a video, but it is so simple if you just set the buttons right as I show.

Maybe I don't know what you are trying to do. Both my keyboards are Midi Controllers and do not have their own sounds. That is what BIAB can handle. You are not trying to play your internal keyboard synth? As best I know, that won't work. BAIB routing is very simple. The keyboard is routed only to the "thru" track unless you record then it can be set to the melody or soloist tracts. You can not sent the midi into BIAB and sent the MIDI out to you keyboard. Again, best as I know. Fact is I never record in BIAB. I save that for the DAW

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BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, 1TB WD Black NVMe SSD, 2TB WDC Blue SSD, 1TB WD Blue, 2 TB SK NVMe, 6 TB External, Motu Audio Express 6x6