I am installing Adobe Campaign Classic in hybrid solution with Adobe Marketing instance On-premise and Midsourcing in Adobe Cloud. Is it possible connect Adobe Campaign Marketing Instance DEV and Adobe Campaign Marketing Instance stage to the same STAGE Midsourcing?
I think this is possible, but one condition must be respected : you have to use 2 different accounts, 1 for each instance, to connect to the MID, otherwise, the data won't follow when the MID sourcing workflows synchronise. Indeed, when the first instance synchronise, it will get all data, but the second instance won't be able to get already synchronised data.
If you have 2 different external accounts, data will be separated / isolated for each instance.