SSO Plugin Schema does not include mappings

I'm unsure how or where the mappings I register in the SSO provider endpoint are being stored, but im not seeing them anywhere, so I'm curious as to how the registered SSO provider knows what to look for? I'm beginning to believe this is why everytime a user is SSO'd even though I get 200 for the response, I error out because the user it's trying to create is all null values which violates my db schema for not null columns.
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