You must have compensation to make IRA contributions. Compensation is generally income earned from working, and is defined here.
https://www.irs.gov/publications/p590a
After passage of the SECURE act, some grants and stipends are considered "compensation" for purposes of making IRA contributions even though they are not "earned income" for other purposes.
"Graduate or postdoctoral study.
Compensation includes any income paid to you to aid you in the pursuit of graduate or postdoctoral study."
If this is the kind of grant you got, you need to delete the 1099-G and enter the grant in the interview section for educational expenses. You don't have a 1098-T, but keep going and the program will ask about taxable grants and fellowships. (Another place it might work is if you enter it on the 1099-MISC screen and check the box for "this was a graduate fellowship" on the page of special situations. This used to work, but I don't know if it is still there.)
If you did not get a grant or stipend for graduate or postgraduate study, then you don't have compensation and your IRA contribution is considered excess. I don't know how to remove it at this point,
@macuser_22
@dmertz
