Pre-approval is a safeguard measure for second-hand real estate transactions to ensure that the seller can get the money after the signing of the housing contract. Because after signing the sales contract, you need to pay surveying and mapping fees, transfer fees and other fees. It was only after the bank loan that it was discovered that the buyer's qualification was problematic, or there was a record of breach of contract, or there was outstanding debt, so the loan could not be made. The whole transaction will be cancelled and the previous expenses will be wasted.
So it doesn't matter whether it is an intermediary notice or a bank notice. In fact, the intermediary is more concerned about whether your qualifications can be loaned, because the bank will get stuck and refuse to lend, and he will be busy and waste time.