I have tried to create a workflow and a top level workflow to version 4.2.1. I am always returning an alert of

Error 403: operation not allowed

I have tried on both a blank install and also an install with the examples no dice

On version 4.4 I am getting Error 403: Not Authorized on an instance with no example data. however if i use the example data it works as expected to create a new workflow

Any assistance would be greatly appreciated

Further update
after doing some testing the [shared] start and [shared] end are not in the empty migration and these, i am guessing, are hardcoded in the work flow builder. without them it breaks the builder.