All is connected in the app, but it won't play.

Dear Sir/Madam
Due to a PowerPoint problem, the electrical supply to the house was shut off. As soon as the power is restored, all three rooms appear to be working in the Sonos App. I cannot get it to play anything until I try to play something. Tune In does not have any radio programs. My Tidal streaming account was used to listen to music. Once again, nothing. I need your help