Outbound Call Option Greyed Out

Three of my agents this evening could no longer make outbound calls in Contact Center.  The option in the lower left is greyed out.  One agent reported a message that " (user) is not in the queues with outbound settings available".  The users are in a queue with outbound call settings so I'm confused.

Our office hours ended at 5pm but that's never been an issue with making outbound calls before.