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Note that Smart Licensing must be enabled directly on the WSA and is enabled separately on the SMA that it is joined to. The documentation doesn't seem to mention that point. For someone acquainted with other Cisco products, but new to Ironport, this...
This post is the number one result when you search for "How to activate smart license in WSA" in Google. It would be helpful if it contained information or a link to an article on doing that.