This is now the authentication system for logging into mySocialSecurity and the IRS.
It is a third-party company handling persons with foreign addresses.
Login.gov handles USA residents.
As of 15 Apr I am no longer allowed to login to ssa.gov with username and password, but am directed to ID.me.
As of 22 May, I discovered I can also login to my IRS account after logging into ID.me. I did not even know I had an IRS account.
To verify identity, you need: