That used to be my stance, that if you were going to use #208 to make the line cover to a mailbox that #206-7 needed to be 2-Not Assigned, as 3-VMS Line Cover is intended for Partner Mail, PM VS, and Partner Messaging, where you set Line Ownership within the voicemail itself.

But I ran into an R6 a long while back, where #208 would not pick up until I set #206-7 to 3, so give it a shot.