Hi All, 

I have a workflow that has been migrated from SP On Premise to Online. 

 One of the differences I found in the IF condition/conditional branch that the option to check if a variable or text field or even a person field is a valid SharePoint user is no longer available. 

Does anyone have any recommendations on how to go about completing this action in 365? 

I have attached a screenshot of the on premise workflow for clarity.