Gives me 0 Items
If you mean running the following exactly
https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UC-9-kyTW8ZkZNDHQJ6FgpwQ&key=
Returns the following error
{
"error": {
"errors": [
{
"domain": "usageLimits",
"reason": "keyInvalid",
"message": "Bad Request"
}
],
"code": 400,
"message": "Bad Request"
}
}
That is because you have neglected to add an API key on the end.
Try testing in the query explorer this seams to return quite a few no idea if its all of them.
GET https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UC-9-kyTW8ZkZNDHQJ6FgpwQ&maxResults=25&key={YOUR_API_KEY}
returns
"pageInfo": {
"totalResults": 786,
"resultsPerPage": 25
},
This apears to return a list of the playlists only for this user.
Update:
If you try and only request videos for this user you get 0 returned. This is not the case for any other user which i have tested.
GET https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UC-9-kyTW8ZkZNDHQJ6FgpwQ&maxResults=50&order=date&type=video&key={YOUR_API_KEY}
This leads me to believe that it is not possible to retrieve the videos for an autogenerated channel. I recommend either logging this as a bug or adding it as a feature request here. Personally i think its more a feature request.