Unable to enroll course under Workfront docs

Hi team,

Tried to enroll course: https://experienceleague.adobe.com/docs/courses/using/workfront-u-1-2022-1-workers.html?lang=en&fromCourses=true and it gives below error: 

To give a background on the course enrolment: Our team is implementing Workfront for the daily run the business activity, so we are trying to understand the platform and its use cases. Please let us know if you need any further information.