I have come across the same issue with a project that i am working on. In addition to the investigations you have done above, I have gone a little further and been able to export the Resource Spec entity using code which is what the Required Resources field points to. I have what i believe to be a valid data map but when importing I get a message saying that Resource Spec is not valid for import. I'm pretty stuck now. As this post is a few months old now, did you manage to migrate services in the end?
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