On Nintex 365, I really need to query a user using the value contained in the user profile Alias field. Any clues on how this could be done using JS or Jquery?
You have "Office 365 Query User Profile" action in the "Libraries and lists".
But not in the form - which is where we need it
Right (my answer was for Nintex Workflow for Office 365).
The theory: User profiles REST API reference
In the next link, you have an example : Vardhaman Deshpande: SharePoint 2013: Get UserProfile Properties with REST API
Just a note about the example: it is for SP OnPrem. Replace the "_spPageContextInfo.webAbsoluteUrl" by a request on the querystring to get the "SPHostUrl".
helpful. I had the same question.
Retrieving data ...