The Partner will not let you assign Auto VMS Cover to Extension (Calling Group) 72. Does the Amanda do supervised transfers? That is, does it not release the transfer until it detects that the ringing ends, so it it doesn't get an answer after a period of time, or a busy signal, it will transfer instead to a mailbox?
The original senario _should_ work, having a additional extension in the calling group, because it is receiving ring at the same time as the other extensions. I don't really follow the note: " But the MOH won't release the call to the machine?" Not sure what Music-on-Hold has to do with the answering machine picking up. Have you dialed the A.M. extension directly? Double checked that it is indeed in the calling group, and receiving ring?