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Kindly try using the shortcode below,
[automatic_youtube_gallery type="channel" channel="https://www.youtube.com/watch?v=nQEtkPglIkA"]Hope this solved your issue!
Reason for the issue:
Technically, our plugin uses the YouTube Data API to get videos from your Channel.
Unfortunately, the YouTube API doesn’t support the channel URL format you have shared with us. So, the solution is to add a channel ID or a Video URL from your channel. When you add a video URL from your channel, our plugin will use the video URL to find your channel ID and display the videos from the detected channel automatically.
The shortcode above uses a video URL from your channel.