For the method to work on Azure DevOps, make sure that the user is part of the team that has access to the Azure DevOps project.
Returns a user object
The Signature introduced in 0.8 works for Azure Devops until version 5.4.0.
Set the local issue assignee based on the remote issue assignee using the method.
issue.assignee = nodeHelper.getUser(replica.assignee.key)