Getting back from your May 2021 post a year ago? As we have been saying there is no EIN on a SSA-1099 form. Turbo Tax doesn't ask for it. You must have entered it in the wrong place. Are you using the Desktop program? You need to use the Desktop program to fix it. Then you have to print and mail it.
So since 2020 rejected then enter 0 for the AGI to efile this year 2021 return.
How to finish a return you started online
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
