Twitch V5 Subscriber [BROKEN API]

Just to add my own experience in here, so the problem may be fixed, I’ve started receiving a 403 from the subscribers endpoint (despite previously having access).

My response from https://api.twitch.tv/kraken?api_version=5&oauth_token=${TOKEN} is

{
  token: {
    valid: true,
    authorization: {
      scopes: [
        "channel_check_subscription",
        "channel_commercial",
        "channel_editor",
        "channel_feed_edit",
        "channel_read",
        "channel_stream",
        "channel_subscriptions"
      ],
    },
    user_name: ${USERNAME},
    user_id: ${USERID},
    client_id: ${CLIENT}
  }
}

And from https://api.twitch.tv/kraken/channels/${USERID}/subscriptions?api_version=5&limit=100&oauth_token=${TOKEN}

{
  error: "Forbidden",
  status: 403,
  message: "Unable to access channel subscribers of ${USERID}"
}