On April 27, 2022, in Cargo Systems Messaging Service (CSMS) #51726538, U.S. Customs and Border Protection (CBP) announced the retirement of the Importer Security Filing (ISF) Portal contained in the Automated Commercial Environment (ACE) Portal. On May 14th, users will receive a notification with information on this retirement, and they will be directed to a list of trade partners that can assist with ISF submissions. The ISF Portal will be retired on June 6, 2022.
CSMS #51726538 can be found here:
https://content.govdelivery.com/bulletins/gd/USDHSCBP-31548ca?wgt_ref=USDHSCBP_WIDGET_2
More information on ISF requirements can be found here:
https://www.cbp.gov/border-security/ports-entry/cargo-security/importer-security-filing-102