Last year i got a identity protection personal identification number for filling my 2022 tax return. Do i have to use this pin to fill my taxes this year as well?

[DoninGA]

Each year the IRS will send you a new IP PIN to be used on the current year tax return.  You cannot use the IP PIN for 2022.

You should have received or will receive a new IP PIN in the mail from the IRS

[CatinaT1]

Your IP Pin will change each and every year. You will receive a letter each year with your new PIN.  

You can get an Identity Protection pin here, or if you lost your IP PIN, you can go here to Retrieve IP PIN. 

[Opus 17]

Once you have an identity protection pin assigned to you, you must use your IP pin every year that you file a tax return (for the rest of your life, as far as we know). The IRS will mail a new IP pin each year to your address on file, so if you move during the year, make sure you inform the IRS of your change of address.  

If you don’t receive or lose the IP pin, you can’t e-file. If you file by mail, there is a place next to your signature to write in your IP pin. If you leave it blank, processing your return will be delayed so the IRS can verify your identity.  

You may be able to retrieve your current year IP pin online, although this may depend on whether or not you have previously set up a verified account with the IRS.
https://www.irs.gov/identity-theft-fraud-scams/retrieve-your-ip-pin