Why is one song recognized but not playing from My Media?

It sounds like you're encountering a issue with playing a specific song using Alexa in a different room than when it was first set up. Here are a few steps you can try to resolve the issue:

• Check the volume on your Alexa device and ensure that it is set to an appropriate level.
• Check the network connection. If the network connection is weak or if there is interference, it can affect the ability of Alexa to play music. Try moving the device closer to your router or moving it to a different location to improve the signal.
• Try restarting your Alexa device and your router.

If you are still having trouble playing the specific song, try playing it from a different device, such as your computer or phone, to see if it is a problem with the file itself.