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@taxtime527 wrote:

The return I e-filed with I7Q6 (with an uppercase eye), was accepted, but the client didn't receive their refund.  

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That is almost certainly Intuit's fault.

The IRS clearly stated how to deal with QMIDs with an "I" or an "O", but Intuit ignored that and didn't let its users know that we had to do a work-around with an attachment.  You may consider filing a claim against Intuit.