Embed for youtube video still uploading

I run a WordPress where the authors post Youtube videos. To save time, they’ll sometimes upload a (large) video, and while it is uploading, grab the link and make their post.

Except the oEmbed fails when trying to get a video that isn’t yet uploaded. Response (from Youtube): Unauthorized.

When their post goes live, the YT link will often not be turned into an embed, even if the video is live.

Is there any way of using oEmbed to either:
1) pass the author’s YT credentials to get the embed code, even if “unauthorized”
2) OR force the system to recheck / reparse the link, even if it thinks it is “unauthorized”?

While typing this, I realize I also have a page cache plugin… I haven’t tested with the plugin off to see if that’s the problem.

Thanks.