The difference between "json" and "scim+json" was causing my Ruby on Rails app to not see any of the parameters being passed into the create/POST request. I assume update/PATCH request content type is also "scim+json" instead of "json", as shown in the documentation.
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Version Independent ID: 506c3302-e823-8f1e-d547-083ef0b664df
@leesmith - I don't recall the details, and I don't have access to the code base any more, but I did write a blog post that seems cryptic in retrospect, but maybe it will make sense. It links to a GitHub thread that may be helpful.