Changing drum size - Training not Registering

Hey everyone, I’ve mostly used 14" mesh heads and just got a 12" mesh head. When I change the drum setting and go to train SP doesn’t seem to be registering the new drum. I’m seeing a signal coming through but the software is not letting me train the drum for some reason and although I’m getting signal nothing seems to be happening.

Any suggestions?

Thanks,
Kyle

Hey! Did u hit the unlock button next to the learn button?