The get-channel-followers endpoint gets the users that follow a channel, not the channels that a user follows. The endpoint you want is get-user-follows which gets the channels that a user follows which does not require an oauth token or a scope.
The get-channel-followers endpoint gets the users that follow a channel, not the channels that a user follows. The endpoint you want is get-user-follows which gets the channels that a user follows which does not require an oauth token or a scope.