Hi,
I've just updated to the latest version of BM - 5.10.0, and have newest spigot as of 5 mins ago. I have given a player the perm bm.command.bmactivity but when they try to /bmactivity 200d ... it says no permission.
The command works for me as op. When I sudo the player with the same command I'm entering, they get a permissions error.

Apologies for the confusion. The permission is bm.command.activity. I've updated the documentation. That being said, it should really be bm.command.bmactivity for consistency. I'll keep this open as a bug.