I HAVE TO VERIFY MY IDENTITY
Sometimes the IRS chooses returns randomly to request verification of identity and sometimes there is something on the return that triggers the request. No matter why the IRS has required you to verify your identity, you need to follow their instructions in order to receive your refund. If you do not verify your identity you will not get your refund.
https://www.irs.gov/identity-theft-fraud-scams/identity-verification-for-irs-letter-recipients
Not sure what you mean by "case manager" at TurboTax. Do you mean that you used TurboTax Live and you are now expecting your "expert" to verify your identity to the IRS? You have to do that for yourself.
So what I meant was that I filed through turbo but I have the audit guarantee so when I hear from the IRS I contact the audit team there. Audit Defense assigns you a tax expert to handle the IRS