If you are getting  new mortgage from CitiMortgage or if they have recently begun servicing your mortgage, they will require your insurance policy to reflect CitiMortgage as the mortgagee by using the following below.

Citimortgage
ISAOA/ATIMA
PO Box 81300
Atlanta, GA 30366
Phone: 800-283-7918 (servicing)
Phone: 800-667-8424 (new loans)

Citimortgage, Inc
ISAOA/ATIMA
PO Box 7706
Springfield, OH 45501