Have you set the PC2 to the correct Option? CONFIG then Advanced Tab according to the manual (P6 of Installation Guide), and I think you should be in Option 2. (And Welcome to the Forum!
)
I have just realised of course that the OP is using BMLinkMLServer and not Beoplayer – obviously for a Mac. Anyway, the problem may be similar because the Advanced tab has an Option ‘IR eye only responds to link commands’ as shown in this post: https://archivedforum.beoworld.org/forums/p/40071/332701.aspx#332701