The error is returned from AWS, Entra is just displaying it to you. The relevant part of the error is:
"name: The attribute name is required"
Based on that.. whatever attribute(s) are mapped to the name sub-attributes (likely some combination of name.givenName, name.familyName, and name.formatted..) are empty on this Entra user, meaning no value is flowing from Entra -> AWS for that attribute.