Deployments does not apply new user/existing user permissions

[IceOfWraith]

Arc: Deployments (via template deployment in the WebUI) does not apply new user/existing user permissions

When selecting a template deployment, clicking "Deploy this Template" and selecting the Deployment Type to be "Existing User" it does not assign the user to the instance. Logging onto the instance shows "This user does not have permission to access this instance. Please ensure that this user has the 'Manage Instance' permission within ADS for this instance." - looking at the user permissions shows that the user was not given permission to manage the instance, or do anything with it.