Spotify API only works with my account even after I added Users

[Ciongu]

My Question or Issue

Recently I have made an app using the Spotify API that displays your top 5 songs and 5 recommendations. The app works great with my account, but it does not work with any other accounts even after I added them in the Dashboard.

The error I get is 400 and 401. Basically it tells me 'no token provided'.