Unexpected error has occurred during the library compilation process: The given key was not present in the dictionary

Hi @luke.neumeister ,

Maybe the upgrade involved also the conversion of Windows-Legacy to Windows project ?

Also, do you have Xaml files referenced out of the Project ? If so, it might be the reason, and in Windows type of Project, you would have to refer the xaml files within the project.

Try placing the Xaml files within your project and indicate that location as the workflow path and then check if it works.

Also another reference :

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