Returned when the scope is granted to you but the crew member has not consented to it for your partner account (or has revoked it). The scope is in the scope field. 
{ "error": { "code": "scope_not_consented", "message": "scope 'crew:documents:read' is not consented for this crew member", "scope": "crew:documents:read" } }
Fix — this is the crew member’s choice. Nothing to change on your side; the data is unavailable until they consent. See how access works.