I'm a fellow user, and we have no way in a user forum to know if your specific email is real or not, but it certainly might be, since TurboTax does send such an email at times. Of course, it is possible for email addresses to be spoofed, so it often creates a dilemma.
See this
FAQ: I received an email about a return with my information being on-hold
https://ttlc.intuit.com/community/security/help/i-received-an-email-about-a-return-with-my-informati...
You definitely need to follow up on this with TurboTax Support ASAP.. Unfortunately, they are closed on weekends right now, so you may not make the 48-hour window. The FAQ says to use the number in the email. So it might be a special number that connects you to a specific dept. such as Security. However, the dilemma is if you don't know if the email is real, whether to use the phone number provided in the email or not. You may first wish to phone TurboTax Support general phone number to see if they can advise you first on the legitimacy of the phone number in your email. You will see a number for TurboTax Support displayed in the following FAQ:
FAQ: What is the TurboTax phone number?
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
Support hours are 5AM-5PM Pacific (8AM-8PM Eastern), Mon-Fri
