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are you using the current IP_PIN

The IRS computers determined that the IP PIN you entered was not valid.

You should have a letter from the IRS with your IP PIN and use information from that letter.

How to retrieve your IP PIN online
You may use this Get an IP PIN online tool to retrieve your current IP PIN.
https://www.irs.gov/identity-theft-fraud-scams/retrieve-your-ip-pin 
The IRS requires you to register and verify your identity in order to use the tool.
This process is essential to protect your personal and tax information.