This is the wrong token type
Client creds basically can’t have scopes
To read whom follows who via the API requires a USER TOKEN not a Client Credentials token
Requires a user access token that includes the moderator:read:followers scope. The ID in the broadcaster_id query parameter must match the user ID in the access token or the user must be a moderator for the specified broadcaster. If a scope is not provided, only the total follower count will be included in the response.
You have the wrong token type