If you have mailed in your tax return, you should not try to electronically file it as this could create more issues when the IRS does process the return. Paper filed returns do take longer to process so the delay is expected. As far as the error code, the attachment is not currently supported and therefore mailing your return was the only way to file your tax return. Hold on to your certified mail receipt as proof that your return was mailed and received by the IRS.
There are steps underway to remedy this in the future but at this time, e-filing when this attachment is required is not supported within TurboTax.
Please see this link from the IRS for businesses for additional information you can use to contact them. If the IRS has written to you and let you know they do not have your tax return, follow the instructions on the letter. Many times there will be a phone number you can use to contact them and find out the best way to ensure your business return is received by them and processed.
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