By law, it is illegal for us as Real Estate professionals to give legal advice. We can however give our professional oppinion as long as we don't cross the line. In as best to not cross that line and help with your question, if a seller requests that an agent receive a pre-approval offer from any perspective buyers, we are bound to obey them as long as it doesn't require us to break the law. In as well if that same seller requests from us to provide a pre-approval from a certain bank / their bank, then we would be required to request that from the perspective buyers. That in no way should bind that buyer to that lender, unless the buyer agreed to this in writing prior to making that application. Hope this helps.