on the ID protection PIN if you requested this optional feature from the IRS in the past (this is 6 digits, different from the 5-digit Pin that TT allows you to assign during e-file), you will need to enter this Pin under "Other Tax Situations" / Identity Protection Pin. TT will let you file without warning this is not filled in, and your Fed and State returns will reject. If have one you will need the 2025 PIN, they change every year. Log in to your IRS account to check your profile and get the latest PIN if you need it https://www.irs.gov/your-account
