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Is the recently announced Visitor ID Service (https://microsite.omniture.com/t2/help/en_US/sc/implement/index.html#Visitor_ID_Service) available currently in when implementing via DTM? If so, can you elaborate on how it's achieved?
Please have a look this documentation for information on using Marketing Cloud ID service with DTM.
Also, I'd suggest looking into this document outlining the Visitor ID requirements.