[joncfoo]

Unfortunately login.gov is only available for use by companies doing business with the US government.

[capitainenemo]

Also login.gov isn't a government issued digital ID. It's just a centralised authentication platform for government use, much like using google or apple for authentication.

It supports the usual options for multifactor (TOTP, text, yubikey/other hardware auth/PIV cards) but for most users it probably ends up being SMS. At best TOTP.