Where do I find the I'd number for a social security w2

If it's asking for an EIN number you are entering it in the wrong place. There is no EIN on social security SSA-1099.

Enter a SSA-1099, SSA-1099-SM or RRB-1099 under

Federal Taxes (Personal for Home&Business)

Wages and Income

Then scroll down to Retirement Plans and Social Security

Then the second line - Social Security (SSA-1099. RRB-1099) - click the Start or Revisit button

If you received a Form SSA-1099 for your Social Security benefits, that is Not entered as a W-2.

To enter Social Security benefits reported on form SSA-1099

Click on Federal Taxes (Personal using Home and Business)
Click on Wages and Income (Personal Income using Home and Business)
Click on I'll choose what I work on (if shown)
Scroll down to Retirement Plans and Social Security
On Social Security (SSA-1099, RRB-1099), click the start or update button

Or enter ssa-1099 in the Search box located in the upper right of the program screen. Click on Jump to ssa-1099