Deductions & credits

you will see the credit on line 30 for Form 1040, but with out clearing that flag, it will remain a problem

 

The form that occurs 'behind the scenes' requires a 'valid social security number; and that is defined in the Form 1040 instructions as 

 

Valid social security number. A valid social security number is one that is valid for employment in the United States and is issued before the due date of your 2020 return (including extensions).

 

So seems like you have to clear up the issue prior to April 15 or request an extension to Oct so that you are eligible for the stimulus.

 

https://www.irs.gov/pub/irs-dft/i1040gi--dft.pdf

 

see page 56 of the instructions (look at the right most column for the definition I posted above)