Hey there! @Nick_Rodgers, Welcome to the Community! 
Thank you for providing the Error code that you are receiving when attempting to onboard the Dishwasher to the ST App. I would be happy to troubleshoot your issue.
Can you please provide me with the model code of your dishwasher, the device that you are using the ST App with (Android or IOS), and any troubleshooting steps you’ve already attempted?
Here is some information on locating the model code on your Dishwasher:
I hope this message finds you well!
^SamsungZell