I have a use case where I need to send a push notification to the same mobile app from two different business units.
For that, I created a Mobile Push app under Mobile Push administration in both Business Units.
The idea is to initialize Mobile Push SDK twice with parameters from App 1 and App 2 in order to register in both of them.
Did you already have this use case ?
I am also exploring other possibilities like custom activities but I rather stay close to standard.