Are you using the most recent IPPIN that the IRS sent you? You can log in to your IRS account to make sure you're using the same number they have on file.
As @ KeshaH mentioned, you do need a new IP PIN every calendar year. So you would need to use your 2025 IP PIN.
Also, for completeness, it may help folks assist you in this forum if you post the exact rejection error code just to be sure everyone is on the same wavelength.