I am logged to my computer app and my phone app and can play music but when I try to play the music on my xbox one or TV app, it asks me to log in and won't log even with my right login/pw. Every device is connected to the same wifi network.
I usually command my xbox app from my computer and never had any problem.
Thanks for reaching out and welcome to the Community! We'll happily help you sort this one out 🙂
Could you try resetting the password for your account using this link? If that doesn't solve the issue, you should also try reinstalling the app on your Xbox and TV.
If the issue persists, you can send us photos of the error messages that come up on your devices. You can do this via the Insert Photos option in the post editor to do this. Just be sure that no sensitive info such as payment or personal data is shown.