A federal filing was rejected because one of the dependents has already been claimed by ex-husband. The rejection notice from Intuit says to review the Description field and it will tell me which child as previously claimed. How do I do that?

[Just-Lisa-Now-]

Look for the number in the square brackets [  ] after the word Dependent in the rejection

[BobKamman]

DUPTIN!  For a three-part blog series about the causes and effects of the IRS "first to file" policy, click here:

https://procedurallytaxing.com/duptin-part-iii/

And you are jumping to conclusions by accusing the ex-husband of being the one who got there first.  It could have been last year's preparer, or a neighbor of the taxpayer who found the SSN in the trash.  IRS never identifies the other claimant.  

[Skylane]

Assuming your client is legally entitled to the dependent’s deductions, you can plan on paper filing with documentation and a long wait… always messy