CommentThreads.list 403

I'm getting:

{"error": {"code": 403,"message": "The video identified by the \u003ccode\u003e\u003ca href="/youtube/v3/docs/commentThreads/list#videoId"\u003evideoId\u003c/a\u003e\u003c/code\u003e parameter has disabled comments.","errors": [{"message": "The video identified by the \u003ccode\u003e\u003ca href="/youtube/v3/docs/commentThreads/list#videoId"\u003evideoId\u003c/a\u003e\u003c/code\u003e parameter has disabled comments.","domain": "youtube.commentThread","reason": "commentsDisabled","location": "videoId","locationType": "parameter"}]}}

for

GET https://youtube.googleapis.com/youtube/v3/commentThreads?part=snippet,replies&allThreadsRelatedToChannelId=UC14YzmOgfiBEvEEeCDAtfjg

I could not identify any video on that channel with comment-disabled.Moreover, I do try similar api call on channels that I know that have some videos with comment-disabled - and this API works perfectly (UCb0igM0fY85iaKarWkcLOAQ) with no errors.

Please advise - what's the logic regarding this error..Thanks