"IDnotify" is a legitimate company, and their service is included in some Turbotax products (if you bought Audit Defense, for example). However, it is also possible for scammers to copy legitimate emails.
I suggest you go directly to https://portal.idnotify.com/login which is the company's official site. Make sure there is a padlock icon in your browser window which means the connection is secure and verified by a third party verifier. Log into your account (you would have gotten the details when you enrolled in Audit Defense) or use their login recovery procedure. Don't provide personal information, and don't click directly on any links in the email.
