Hey there,
So I was trying to send a message to two people, so I was using the field box where I would type a name into the "Other Recipient". So let us say there are two names - Mr X and Miss Y - ( I know but just go with it!)
So when I type Mr X in the main recipient box and Miss Y in the Other Recipient box - it would say Miss Y does not exist. So I tried to switch the positions of the name, I put Miss Y in the main recipient box and Mr X in the "Other Recipient" box - it would say Mr X does not exist.
But sending the message separately works perfectly fine.