Starting Monday, Dec. 10, all users of the IRS’s e-Services platform must register through a new ID-proofing process called Secure Access.
Any e-Services user who has not previously created a Secure Access account through Get Transcript Online, IP PIN tool, View Balance or by exception processing must validate their identity through this process. This also includes all TIN Matching users, and users who received Letter 5903 last December and authenticated by telephone.
This new process is mandatory on the part of the IRS or its online users, the agency stressed.
https://www.accountingtoday.com/news/irs-e-services-users-now-register-through-secure-access
https://www.irs.gov/tax-professionals/e-services-online-tools-for-tax-professionals