When the source is a planner Task List
ThisItem.createdBy.user.id shows the Id, but ThisItem.createdBy.user.displayName is empty
Tried to add a column to a dataTable with this field, but that is empty also
I have made a test on my side and the issue is confirmed on my side.
As an alternative way,you could refer to screenshot below to create the flow to get the created by displayname:
The flow would run successfully as below:
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