For the last 6+ years I was using Nintex Workflows so I am fairly new to Flow. In my scenario a user creates a document in a SharePoint library and populates a People column. In my flow I want to use the value from that column and also get the email address and phone number for the user and update the properties. The problem is that it might take a while before that column is populated and the flow is triggered when the file is created. I am trying to use the Do until action with a Condition but it doesn't seem to be working. If the value is not populated immediately (there is a 1 minute delay at the beginning) the Condition is always resolved to true (Yes). Any idea why? What am I missing here? 
