https

Coco the movie :

They learn that Imelda cannot cross because Miguel removed her portrait from the ofrenda. Furthermore, Miguel has to be restored to the Land of the Living before sunrise or he will become one of the dead. The curse from the Riveras which sent him to this plane of existence can be undone by the blessing of a family member such as Imelda; she gave Miguel her blessing with the condition of abandon his musical ambitions. Just as he received the blessing, Miguel disobeyed the condition and was sent back with Imelda which now forces him to accept her conditions but Miguel refuses and escapes to search for Ernesto, figuring he can get a blessing from that ancestor with no such conditions.