youtube api cannot upload to a channel of mine

I am using C# (.net 7) and google api package to upload but cannot upload it to a specific channel. It seems it ignores video.Snippet.ChannelId

video.Snippet.ChannelId = "UCXXXXXXXXXX";

whenever I try to upload this way it upload to personal account (default youtube channel)

I also tried to use OnBehalfOfContentOwnerChannel and OnBehalfOfContentOwner

            var videosInsertRequest = youtubeService.Videos.Insert(video, "snippet,status", fileStream, "video/*");            videosInsertRequest.OnBehalfOfContentOwnerChannel = "UCXXXXXXXXXX";            videosInsertRequest.OnBehalfOfContentOwner = "{ChannelHandler*}";

I am getting the below error;

An error prevented the upload from completing.The service youtube has thrown an exception.HttpStatusCode is Forbidden.Google.Apis.Requests.RequestErrorThe authenticated user cannot act on behalf of the specified Google account. [403]Errors [    Message[The authenticated user cannot act on behalf of the specified Google account.] Location[ - ] Reason[accountDelegationForbidden] Domain[youtube.common]]Google.GoogleApiException: The service youtube has thrown an exception. HttpStatusCode is Forbidden. The authenticated user cannot act on behalf of the specified Google account.   at Google.Apis.Upload.ResumableUpload`1.InitiateSessionAsync(CancellationToken cancellationToken)   at Google.Apis.Upload.ResumableUpload.UploadAsync(CancellationToken cancellationToken)

I am pretty sure I am missing something but not sure what. I have similar issues to download my own caption but I am assuming this will also fix that issue as well.

*Channel handler is what you see in the channel page with @ eg for https://www.youtube.com/@VOLEapp I assume it is VOLEapp

Thanks,