Error updating selection list
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If you want the playlist item to have a particular position in the list, you need to first update the playlist's Ordering option to Manual in the playlist's settings.
This error indicates that the user has an unlinked Google Account, which means that the user has a Google Account but does not have a You Tube channel.
Such users can access many features that are dependent on user authorization, such as rating videos or adding videos to a playlist.
Note that some channels may not have permission to offer embedded players for live streams.
For error checking, use error codes, not error messages.
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However, as an example, the user would need a You Tube channel to be able to upload a video.