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Troubleshooting 940/941 e-file reject error: 5-digit PIN & 6-digit EFIN combination is not valid signature
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Get an Identity Protection PIN to protect yourself from tax-related identity theft - Taxpayer Advocate Service
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We verified your documents to support your identity theft ... - IRS.gov: Fill out & sign online | DocHub
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IRS Notice CP01A - The IRS Assigned You an Identity Protection Personal Identification Number (IP PIN) | H&R Block
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