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You will have to serve them by registered or certified mail, with an email backup. Here's the Mar. 20, 2020 notice:
"USCIS Service of Process Notice
Effective immediately and until further notice, U.S. Citizenship and Immigration Services (USCIS), Office of the Chief Counsel is not accepting personal service of process for actions against USCIS or its personnel in their official capacity, due to the on-site staffing shortages caused by the COVID-19 circumstances.
The following procedures do not modify the requirements of Federal Rules of Civil Procedure, Rule 4(i)(3) regarding service on an officer or employee sued in his or her individual capacity and should not be used in any action to attempt to perfect service upon any Department officer or employee sued in his or her individual capacity.
Pursuant to Federal Rules of Civil Procedure, Rule 4(i)(2), mail summons and complaints against the Department or its personnel in their official capacity by registered or certified mail, to:
USCISOffice of the Chief Counsel20 Massachusetts Avenue, NWRoom 4210Washington, DC 20529
To aid in prompt handling of any summons and complaint, parties are encouraged to also email a copy to: firstname.lastname@example.org
Email subpoenas requesting information or records from USCIS or its employees in their official capacity to: email@example.com"