You are kind to volunteer for this. But...without his account and user ID you cannot access his 2023 return. You could get a transcript or a copy from the IRS
https://www.irs.gov/individuals/get-transcript
https://www.irs.gov/pub/irs-pdf/f4506.pdf
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
