I am using Turbotax business 2018. My federal return was rejected.

[ps40]

Description of error: Binary Attachment 8453 Signature Document; /efile:Return/efile:ReturnHeader/efile:SginatureOptionCd

To resolve this reject select the "File" tab in interview, there is information for attaching a .pdf of Form 8453.

What is an interview? Where do I go to upload thei form?

[SweetieJean]

<a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-pdf/f8453.pdf">https://www.irs.gov/pub/irs-pdf/f8453.pdf</a>

[tagteam · Accepted solution]

https://ttlc.intuit.com/replies/7348951

[tagteam]

" What is an interview? Where do I go to upload thei form?"

The attachment functionality in TurboTax Business appears to have been removed in the latest update.

I have reported this to the Moderators who, in turn, will inform the developers. 

Hopefully, there will be a fix soon.