Since you used TurboTax desktop to file your return, hopefully you saved a copy of the original return before you amended it. If so, try making another copy of that original return and start the amended return again. Then, wait until after March 6 to electronically file it.
This should eliminate two of the possible causes - the possible TurboTax processing error and the unknown missing or invalid data problem. If it is still rejected, filing by mail is an option as a last resort.
@Annoyed_
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