You cannot email the IRS---so not sure what you tried to do. Email is not the way to respond to a request to verify your identity.
I HAVE TO VERIFY MY IDENTITY
https://turbotax.intuit.com/tax-tips/security/tips-for-handling-identity-verification-requests-from-...
https://www.irs.gov/identity-theft-fraud-scams/identity-verification-for-irs-letter-recipients
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