@Just-Lisa-Now- No they didn't receive EIP 3 also income to great. Looking further the Student was Age 24 at end of year, Student Jan - May 2021, Income greater than 4300.00 at 31,000.00. Taking into account Age and Income I cant see why they would disallow the 1400.00.

With Income at 31000.00 he would have paid greater than 50% of support also. 

I am over thinking this I think. 

Thanks