Are you referencing the python get_sockets_by_tag? As that’s not useful at runtime, and I also believe those tags are from the tag manager that’s unique to static meshes. You can retrieve tags from a static mesh socket like this:
But since you’re using an SKM, I don’t believe there’s a tag manager for SKM sockets. I couldn’t find a node for it at least. As a workaround, I’d use common naming of them and just verify they exist in a test.