Do you mean the IRS has requested that you verify your identity? TurboTax cannot help with that. You have to follow the IRS's instructions and do that for yourself.
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
Or---do you mean something else? ("I can't load the app")
Many people have multiple TT accounts and forget how to access them. Log out of the account you are in now.
Account Recovery
https://ttlc.intuit.com/questions/1901535-forgot-your-turbotax-online-user-id-or-password
https://ttlc.intuit.com/questions/1901486-how-many-turbotax-accounts-do-i-have