41 CFR § 102-118.75
What if my agency or the TSP does not have an account with a financial institution or approved payment agent?
June 9, 2020
Under 31 U.S.C. 3332, et seq., your agency must obtain an account with a financial institution or approved payment agent in order to meet the statutory requirements to make all Federal payments via EFT unless your agency receives a waiver from the Department of the Treasury. To obtain a waiver, your agency must contact:
The Commissioner
Financial Management Service
Department of the Treasury
401 Fourteenth Street, SW.
Washington, DC 20227
http://www.fms.treas.gov/