@ehammers
[Edited for clarity 5/26/22 at 00:15 AM Pacific.]
I don't know about the legitimacy of (or lack of) your email, but IDnotify can come into play if you purchased Max Benefits or Premium Services, as I'll explain below. Did you purchase one of those products? Even if you did, there are some precautions you should take to investigate. I would think an alert notice would come from IDnotify and not purportedly from Intuit, but I don't know how that works.
This is a user community forum--not a direct route to TurboTax Support--so we don't know if your email is legitimate or not. The safest thing to do, as you mentioned, is to first be extremely cautious, and do not click on any links in the email and don't download any attachments. Here are some ways you can investigate:
To speak to TurboTax Support about the email to see if they can verify it:
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
Intuit Security can also evaluate it, if you forward a copy to them with the headers intact. Go to this page
https://security.intuit.com/contact-us
Scroll down to a blue button where it says: Report a fake/phishing email: "Did you get an Intuit email that doesn't seem right?"
Did you purchase MAX Benefits, or are you a California filer and purchased Premium Services?
Those 2 add-on products include identity monitoring and identity protection services and use IDnotify, a part of Experian.
If you purchased one of those products, here is another TurboTax FAQ about IDnotify, which provides a direct link to the IDnotify website without using an email link. Once you are at the main IDnotify website, go to their "Contact Us" page using the contact tab at the very top. Then you should see a page with their phone number. However, I don't know if using that general IDnotify customer service phone number will be able to help you or not, since with MAX or Premium Services you are partnering through TurboTax, so there's an extra layer that the IDnotify agent may or may not be familiar with.
FAQ: Who is IDnotify and what is their relationship to TurboTax?
https://ttlc.intuit.com/community/choosing-a-product/help/who-is-idnotify-and-what-is-their-relation...
