I've used Idme and had no issues with them.
ID.me, which has been around since 2010, was originally used by e-commerce sites (and still is) to verify the identity of retail customers.
State governments then began adopting the ID.me system as a way of preventing people from defrauding their unemployment claims systems.
If you are a new Online Account user, you must create an ID.me account at the IRS and verify your identity.
ID.me is a trusted credential service provider selected to support IRS.gov login services.
ID.me uses the latest in identity verification technology to authenticate your identity quickly and easily.