If it is the attorney who has instructed the bank, I can understand this raising a “red flag”. Whilst I have not seen it, I can well understand the Court of Protection/OPG waning against accepting instructions from an attorney for the transfer of assets into their name.
If it is the donor client who has instructed the bank, the response is surprising and I suggest the bank be asked to either provide a copy of the “rule” to which it refers (or provide a link to the appropriate web page). In this scenario, I suspect there has been a mis-reading of the “rule”.
Paul Saunders