Microsoft.ResourceManagement.WebServices.Client.AuthenticationRequiredException: Authentication information is required

Catchy title right?
If you have been programmatically creating SSPR registrations you may have hit this error, it only seems to happen if you are updating the same account that is making the call though. So that’s the fix try a different account! I’m not quite sure what MPR if any is causing this but if I find out I will update the post.