Over the weekend, 9to5Google reported that second-gen Chromecast and Chromecast Audio devices displayed an “Untrusted device” error message, preventing users from casting audio and video content onto their screens of choice.

Chromecast users have encountered an 'untrusted device' error affecting older generation devices, particularly the 2nd generation Chromecast and Chromecast Audio. Google has acknowledged the problem and is working on a solution,

Chromecast (2nd Gen) and Audio users are locked out of streaming due to an "Untrusted Device" error—here's why it's happening and what to expect next.