After I was rejected the second time, it again got the message with no target date:
Description of error:
There is a potential issue with the calculation of your Taxable Inherited IRA.
What needs to be done:
There is a known issue with the federal return that has been addressed in a software update. Please update your software to the latest version. After applying the update, make any applicable changes if necessary, and re-transmit the return. Note: The calculation change may affect the taxpayer's refund.
I just called customer service, who said on their end it was still showing the March 5th date for this issue being fixed, and that I should try again tomorrow or Saturday.
