The 5071C letter doesn't state anything about setting up the ID.me account. 

It says to have 1) the letter 2) the form 1040 for tax year shown on letter    

Client (Amish) came to my office to use my computer since he doesn't have one, thinking it would be just going to the www.idverify....   and to answer some questions...  HA !   Needless to say it was a waste of his and my time.  He doesn't have a computer or an email address or a cellphone.