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Hi @Lizhoney - Spotify isn't available for download on a Sense 2, do you have a Sense original?
If so, there are 2 things, you can use the builtin music controls of the watch and don't need to install Spotify or have a premium account.
To clear the loading try logout of the Fitbit App and swipe off the active window and in Android clear the storage cache and force stop it and then restart the phone.
Restart the watch by holding the button for 10 seconds till it vibrates and the logo appears and wait for it to start.
Login and wait for any pair, link or Fixit prompts and sync.
A failed app load can be quite difficult to stop.
Author | ch, passion for improvement.