Create Case Queues and Assignment Rules

Hi. 

I completed all the steps of Create Case Queues and Assignment Rules and Ada Balewa is a selected member of the 'Product Support Tier 2' queue (see screenshot). Also, the user is active. However, this error appears when I try to complete the challenge: We can't find user 'Ada Balewa' as a selected member of the 'Product Support Tier 2' queue.