"Filed in 2015 using 1040-SR Form" - why mention 2015, where are you being asked about this - TT 2025 will ask about 2210 Line 4 from 2024 for the safe harbor calculation under Other Tax Situations / Underpayment Penalties
see comments here if this helps
https://ttlc.intuit.com/community/taxes/discussion/i-am-no-longer-working-but-i-am-getting-a-message...
