Make sure while setting up SSO, you're passing the correct attributes:
email: Requiredgiven_name: Optionalfamily_name: Optional
Here's the exact schema mapping in JSON:
{
"email": "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier",
"given_name": [
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname",
"http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name"
],
"family_name": "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname"
}