Is this message legit? We've noticed that someone attempted to fill out a tax return using your information with a different account.

where did you receive this message? it is possible somebody has used your identity to file their taxes.  see the below link

https://ttlc.intuit.com/questions/1900655-what-to-do-if-you-suspect-tax-related-identity-theft

I was sent an email.  Anything is possible but I can't imagine anyone actually having my information.  I filed my taxes in March.  I'm trying to figure out if this email was just a phishing scam or if it really came from Turbotax.  I logged in to my account with Turbotax and didn't see any notifications on the site.