If you received a letter from the IRS requesting that you verify your identity, then follow the instructions in the letter. TurboTax cannot help with this. This is between you and the IRS.
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://turbotax.intuit.com/tax-tips/security/tips-for-handling-identity-verification-requests-from-the-irs/L55RhaS2B
https://www.irs.gov/identity-theft-fraud-scams/identity-verification-for-irs-letter-recipients