Sometimes you need to assign values to people lookup fields when you don´t know the exact login name of that certain user.

In this case, you will fail assigning the plain displayname. However, there´s a small workaround to handle this problem.

You need to build your own "technical" lookup value in a simple text variable ("Person") and use -1 as fake user id.

For example in the following way:

You can assign "Person" now to people fields 

Keep in mind that you will run into trouble if there´s persons with the same name.

Markus Alt