HDFC is not accepting NRI General Power of Attorney

My sister in USA has executed a GPOA in favor of myself in India registered in US consulate and stamped acknowledged notarized in India as well.

While Bank of baroda has accepted it. HDFC is refusing for no good reason. Are there any laws or rbi guidelines than you can refer me to that I can use as evidence to compel HDFC to accept

What is the purpose of this GPOA?

What’s HDFC reason for denial? What kind of POA are they expecting?