Unable to eFile 2023 Wisconsin Trust return - transmissions are not available

I am unable to eFile a 2023 Wisconsin trust return using Turbotax Business.

 

The error message is:

 

"Tax Year 2023 transmissions are not available.  TurboTax Business is not ready to process Tax Year 2023 for this return."

 

eFile of the same return for Federal worked fine and was accepted.