Description of the problem:

Running the MTV plan workflow using the name of an already existing successful plan results in an expected failure, but the error message simply says "Unknown error, status code 409"

How reproducible: 100%

Steps to reproduce:

1. Execute an MTV plan workflow that succeeds 

2. Execute a new MTV plan workflow, using the same migrationName as the previous successfuly workflow

Actual results:

The workflow fails (as expected),  but the error message simply says "Unknown error, status code 409"

Expected results:

A clear error message stating why the failure occurred