Sometimes, it might be because of copyright restrictions. Or, your Insta app might need an update to support the music feature properly.
Maybe it's a technical glitch. Sometimes, the app might have temporary issues that prevent the music feature from working properly.
Maybe there's a problem with your settings. Check if the music option is enabled and if you have the right permissions.
Maybe there's a technical glitch with the app. Try restarting your device or reinstalling the Instagram app.
Maybe it's a glitch in the app. Sometimes these things happen and it'll sort itself out after a while.
Another possibility is that the music you want to use isn't available in Instagram's music library. Instagram has a limited selection of music that can be used in stories. Try choosing from the available options instead.
It might be that your internet connection is weak, affecting the music playback. Or, it could be that the music you chose isn't compatible with Instagram stories for some reason.
Maybe there's a glitch in the app. Sometimes these things happen and you just have to wait for an update to fix it.
Maybe there's a problem with your app settings. Check if music permissions are enabled.
Maybe there's a glitch in the app or your device settings aren't allowing it.
It could be that your Instagram account doesn't have the necessary permissions or your app version is outdated. Check for updates and your account settings.