V3 Get Channel Followers Replacement in Helix?

API
8

Did you set the v5 header correctly?

https://dev.twitch.tv/docs/v5/guides/migration

curl -H 'Accept: application/vnd.twitchtv.v5+json' \
-H 'Client-ID: uo6dggojyb8d6soh92zknwmi5ej1q2' \
-X GET https://api.twitch.tv/kraken/streams/