I'm getting a message on the console MWG:
TX WARNING Forwarding to a non extant partner <partner name> - partner has no device
Alquem have no idea what it is?
I moved this to Web Gateway for faster handling as that is what appears in your profile.
This is no default MWG message. it might be a customized one though. You should use rule engine tracing to see where the transaction stops to identify the rule and the respective error reason.