Get the logged in users Dynamics user record ID in a Canvas PowerApp

When working with a canvas PowerApp that integrates into Dynamics 365, you occasionally need the current users’ Dynamics user GUID. This could be used to populate lookup references on the various records within Dynamics.

The user details provided by the User function within a Canvas app relates to the Office 365 user account of the logged in user. We know that for a single user, who has access to multiple Dynamics environments, there is no guarantee that their Dynamics user GUID would be…