I think that is a BIAB limitation! I run two keyboards over USB with Win 11, no problems. Also run a midi controller via USB at the same time. As well as my midi in and out via the MOTU Audio Express. So I never have issues with MIDI routing except back in the day when I tried to run Helicon Voicelive and use the Voicelive Editor software with BIAB.
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
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