IRA contribution

Hello,

I file jointly with my husband.  He has retirement plan from his employer. He has 401k in 2023. He has his own traditional IRA account but we did not put any money in in 2023. I do not have retirement plan and only part time job in 2023. 

When I work on IRA section in turbutax , there is nothing can be deducted from IRA contribution if we plan to put money in my husband's IRA account for 2023.

The reason is AMGI over 137,000

 

But I find if I go to open a IRA account under my name and put $6500 in, all the amount is deductible.

 

I want to know why? Since we filed jointly, why there is difference between put money in my IRA account and his IRA account?

 

Thank you.