Thanks to @RachelGomez123 for helping here!
I understand the feeling of not being able to play music on your Google Nest Mini. Let's get to the bottom of this. A few questions: when did the issue start? Have you tried playing music on other music services like YouTube Music and Pandora? Does the same thing happen when you use the Google Assistant app on your phone?
Try these steps below:
Let me know how it goes.