I read this story at another source last night - I can’t recall where, maybe Judicial Watch, maybe The Daily Caller?
Anyway, the “Admonishment” is actually a scheduled annual meeting between every FBI confidential source and the FBI agent who supervises that source.
In other words, it’s like the annual meeting we all have with our own employers to get a refresher course on sexual harassment laws, etc., etc.
So, it’s unlikely that Christopher Steele was actually “admonished” for a specific violation at that meeting.
However - from memory - Steele violated the news leak prohibition like two months after his Admonishment review, so he clearly can’t plead ignorance of his agreement.
Justice / FBI never admitted they paid Steel to spy on Trump. The real story is that he received 11 payments from the FBI to spy on the Trump campaign with Russian resources.