You do not have moderator:read:followers on the token used to call this endpoint
Or (the token has the scope and) the user in the token is not a moderator for 96001457/Sunefirst
If you do not have the scope (or are not a mod) then only the total is returned.
If you are authorised to see whom follows (with the scope and being a mod or better) then the data array will be populated
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.