I confirmed the claim type is middle_Name. Below is a portion of my decoded token:
"email": "builder_bob@buildit.com",
"name": "Bob Builder",
"given_name": "Bob",
"middle_Name": "the",
"family_name": "Builder",
"streetAddress": "124 A Street",
"city": "Springfield",
"state": "IL",
"postalCode": "39482",
"country": "United States",
"telephoneNumber": "4032224564",
The email, given_name and family_name map with no issue. None of the additional fields will map.