I believe the difference is that Intuit is catching a duplicate that has been filed through Intuit. I don't know if it means another has been filed through Lacerte, or just any of the Intuit Family. 

The only out is to paper file, which is a form of purgatory in today's IRS mail processing. If ID theft is involved, IRS will inform the client. https://www.irs.gov/identity-theft-fraud-scams/identity-verification

Especially if this is a client new to you, verify your data entry and ask to see the Social Security card. Let the client know what is happening.