On our way into the Adobe world, I stumbled upon this Tealium tagd, "Adobe Analytics Cookie Matching Service".
I cannot find any more info about it and cannot understand from the one sentence description what I would use it for. What would be a use case for this tag? Why would I like (or need) to use it?
As I understand it, this tag is meant to be used for stitching visitor cookies when you are implementing Adobe Analytics by using the Tealium collect tag and Event Stream. I don't have much experience with it, but I can imagine it's meant to match the cookies from Tealium with the ones from the Marketing Cloud. Probably the connector in Event Stream just reads the aa element in utag_main:
There's no need for this tag when doing a classic client-side integration.