Please answer a question about the following article about Eton College:

It criticised Forsyth's decision to record a conversation with Harry as an abuse of teacher–student confidentiality and said "It is clear whichever version of the evidence is accepted that Mr Burke did ask the claimant to assist Prince Harry with text for his expressive art project ... It is not part of this tribunal's function to determine whether or not it was legitimate." In response to the tribunal's ruling concerning the allegations about Prince Harry, the School issued a statement, saying Forsyth's claims "were dismissed for what they always have been - unfounded and irrelevant." A spokesperson from Clarence House said, "We are delighted that Harry has been totally cleared of cheating."

What was potentially considered abuse of teacher-student confidentiality?
Forsyth's decision to record a conversation with Harry