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Hello! I am currently working on a react.js application that is integrating with the MusicKit v3 library. I have followed the documentation to generate a JWT for MusicKit and add the library to my application. Using my token I am able to successfully retrieve song information from the Apple Music API, but I am having trouble with authentication. When I call music.authorize() and successfully go through the Apple sign in popup, I am receiving the following 403 error: https://play.itunes.apple.com/WebObjects/MZPlay.woa/wa/webPlayerLogout 403 musickit.js:44 Uncaught (in promise) AUTHORIZATION_ERROR: Unauthorized After stepping through the music kit API and login popup with breakpoints, I am seeing that the music user token is null, despite the login popup succeeding and returning a proper token/response: {"isAppleMusicSubscriber":"true","musicUserToken":"Ak4ItOgRRRG2y6xgA/OeWQPK0RqPQ/esAJkRN0B/Ua/AWLT52tLhd2TfzMK6uhH+Nczvd7wjYDM1UewG/NledKtimwlrR+s5tdQPk/FG28zqhBqXZ12q6LC516w8ELZDwv5T61kV8xiJ1KSO1q4pGi01JO7SuPMtOqB/QsycYj+xNnrYUEwlP5tm/zxfg7bWmvuWMwfUruYR+A1U9FdXZsdIITVmxCjiHg8ro9xXRzl6Txhsag\u003d\u003d","cid":"REDACTED","itre":"REDACTED","supported":"REDACTED"} I have tested my application with multiple Apple Music users who have paid subscriptions. All accounts are receiving this same error. I have tried regenerating my JWT token multiple times following various guides. My latest attempt used the following node library and parameters: var jwt = require('jsonwebtoken'); var fs = require('fs'); var privateKey = fs.readFileSync('./AuthKey_MYKEY.p8'); let now = new Date(); let nextMonth = new Date(now.getFullYear(), now.getMonth() + 1, now.getDate()); let nowEpoch = Math.round(now.getTime() / 1000); // number of seconds since Epoch, in UTC let nextMonthEpoch = Math.round(nextMonth.getTime() / 1000); // number of seconds since Epoch, in UTC var payload = {     iss: 'REDACTED', // TEAM ID     iat: nowEpoch,     exp: nextMonthEpoch }; var options = {     algorithm: 'ES256',     header: {         alg: 'ES256',         kid: 'REDACTED' // KEY ID     } }; jwt.sign(payload, privateKey, options, function(error, token) {     console.log(error);     console.log(token); }); I have a valid App Identifier created with the MusicKit App Service enabled. I am stuck! I have no other ideas on the possible root cause here. Is there something I am missing? I have a mobile app currently in Test Flight - does this app need to be released to the app store? I am out of guesses! Any support here would be greatly appreciated! Thank you for your time. Patrick