I'm going to make a connection between Sales Cloud and Marketing Cloud. I'm very new at it and never done that before. Before the project starts, I've did some research to prepare myself to make it right. I made some notes based on documentation and I have some questions. I believe you could help me a little:
What does it mean - "Subscriber Key is required for Marketing Cloud Connect. If it is not enabled in your Marketing Cloud account, complete a Subscriber Key Migration before proceeding with the connection process." As far as I know, subscriber key is a kind of ID that every subscriber has. If I'm wrong - how to find out if this functionality is enable in my org?
How can I find out, which version of Marketing Cloud environment I use? I know that business units will be needed so we should have Enterprise 2.0. Can I check a version of environment by myself or is that something that customer should inform me about?
As connection process is quite complex, I'd like to make it first on testing environment. I know that there is a possibility to make a copy of original org in Sales Cloud (sandbox), but is there the same possibility to make a copy of original Marketing Cloud org? I've read that to get access to a SMC sandbox, I should contact with my Salesforce rep, but I don't know if that's still possible. And I've also read that Marketing Cloud sandbox doesn't support Marketing Cloud Connect (but this is an information from April).