The term Change of Status (COS) is the name given to the process through which a person can change from one temporary status (nonimmigrant) to another temporary status without having to leave the United States. Typical examples of this process are changing from a student visa status to H-1B. Usually, a successful COS is evidenced by the USCIS issuing you a new I-94.
Changing status from a temporary visa to a green card within the United States is also a change of status, but it is technically referred to as Adjustment of Status (AOS).
People have been asking us about USCIS "warrant issued for background check" for failure to report a change of address by filing Form AR-11. While it is true that until you are naturalized, you are required to update your change of address each time within 10 days of moving; this email is a scam. DO NOT WORRY.
For instance, see the Header. It is NOT from a .Gov domain. I have reviewed the metadata as well.
The US State Department has made the following announcement today regarding the phased resumption of visa services.