866-602-4279 is a valid number for the Security and Privacy Team.
Similar security alerts are sent when you or someone else opens a new account with your SSN or other personal information. Sometimes people create second accounts by mistake. You can use the account recovery tool to see if you might have a second account associated with one of your email addresses. https://myturbotax.intuit.com/account-recovery/ If the new account is one that you are using to file a return, you can contact the security team to have them release the return.
If you believe that you did not create a duplicate account, you should read the below advice and call TurboTax Privacy & Security right away. Someone may have tried to file a tax return with your SSN.
However, it is also possible for scammers to copy and alter legitimate emails. For example, Turbotax will never tell you to install files from an email attachment, or to send personal information via email. Make sure you do not answer any personal questions by email, and don't put personal information into a web site unless the address is intuit.com and it shows a padlock icon that means the web site is verified by an outside security company.
If you want to independently get a verified number for customer support, use the web form on the Turbotax web site.
https://ttlc.intuit.com/replies/3300041
https://ttlc.intuit.com/replies/4838253
