In duo, my ally had a gold whelp smuggler and two dragons. I played doting dracthyr, and their team got the attack, but whelp smuggler didn’t trigger. The next turn, however, the whelp smuggler did trigger off of the doting dracthyr. Ally sold the whelp smuggler the next turn, so I couldn’t see if it happened again.
The first time, I was watching his board, so I don’t know if that effected it at all.