SFDC Connector with OAuth JWT connection "user hasn't approved this consumer"

SYMPTOM

org.mule.runtime.api.connection.ConnectionException: Invalid status code: 400, response body: {"error":"invalid_grant","error_description":"user hasn't approved this consumer"}
  org.mule.runtime.api.connection.ConnectionException: Invalid status code: 400, response body: {"error":"invalid_grant","error_description":"user hasn't approved this consumer"}
  Caused by: Invalid status code: 400, response body: {"error":"invalid_grant","error_description":"user hasn't approved this consumer"}

CAUSE

The error is due to the incorrect permissions for the user profile in Salesforce.

SOLUTION

• Log in to your Salesforce Instance
• Go to Settings > Manage Users > Profiles 
• Edit the profile associated with the user configured in the connector.
• For 'Connected App Access' under the profile, select the Connected App