Jamming project

Hello Everyone! I am now at the Spotify API(Part One) project and I am stuck here for a while now probably 4 days.
And I am glad if some of you can help to finish this project. I finished the coding process but I am stuck in deploying and when I try it on other devices it won’t work can someone please tell me why. You can visit my project here: Jamming
Or check out my GitHub repo here: GitHub - JoseeGregorio30/spotifyappone