This is a repeat of the previous advice you received:
Connect a working MIDI cable from the OT’s MIDI Out port to the MD’s MIDI In port.
In the OT’s PROJECT > MIDI > SYNC menu, activate PROG CH SEND and set CHANNEL to your preferred number.
In the MD’s GLOBAL > CONTROL > PRG CHANGE menu, set PRG CHANGE IN to “ON”, and set CHANNEL to match the number you selected on the OT.
If this doesn’t work, make sure that the MD’s GLOBAL > CONTROL > BASE CHANNEL has NOT been set to “–”.
If this doesn’t work, check whether the OT is sending any MIDI messages (notes, clock) from its MIDI Out port.