In proseries there are two questions, 

Can taxpayer be claimed as a dependent?  

If yes, was taxpayer claimed as dependent?

The e-file was Yes and No respectively.

They were able to deduct the student loan interest for this return, which means they did claim themselves, 

That being said, if the return was mailed the responses are not mailed in so the IRS doesn't get that information.  Are the responses to these two questions sent to the IRS in the e-file?  Otherwise the IRS wouldn't know that the response was yes to can they be claimed?    They actually can not be claimed by the parents because they have graduated and their income is over $38K.   

They are worried that because yes was the answer on the first question, that the stimulus payment is being withheld from them.  I don't think that is the case.

Thanks,