You can't use that PIN again. According to the IRS:
How to get an IP PIN
The fastest way to receive an IP PIN is by using the online Get an IP PIN tool. If you wish to get an IP PIN and you don’t already have an account on IRS.gov, you must register to validate your identity. The IP PIN tool is generally available starting in mid-January through mid-November. Select the following link to get started: Get an IP PIN
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