This error message is only visible to WordPress admins
Error 403: Requests from referer https://www.googleapis.com/youtube/v3/channels?part=id,snippet,contentDetails&forUsername=teteu4500&key=AIzaSyCa_qbZawfZa7dBArsUyGJh3zP3evZ-1y8 are blocked..
Domain code: global
Reason code: forbidden
Error: No videos found.
Make sure this is a valid channel ID and that the channel has videos available on youtube.com.