This one comes straight from X: we asked for the post and X said there is nothing at that address. Four things cause it, and you can usually tell which in a few seconds.
The post was deleted
The most common by far. Once an author deletes a post, the video goes with it — X keeps no public copy, so neither we nor anyone else can produce one. If you saw it hours ago, this is almost certainly why.
The account is gone
A suspended or deactivated account takes all of its posts out of view at once. A quick check: open the author's profile in the X app. If the profile itself is missing, every link to their posts answers the same way.
The link lost a piece
A link copied out of a message, an email, or a screenshot often arrives shortened or cut: one missing digit at the end of the number and the address names a post that never existed. Copy it again from the X app with Share, then Copy link, and paste it without typing anything.
The post is withheld where we ask from
X sometimes hides a post in a given country while leaving it visible elsewhere. You may see it on your phone and get nothing here, because the question is asked from somewhere else. Rare, but it happens, and it is not something we can route around.
What this message is not
It is not a private account and it is not a sensitive post: those two answer in their own words. If the post is plainly there in front of you and the link is the one X gave you, try once more in a minute — X does have bad moments, and the message is the same.