Currently there is no way to query a user by ID.
Having migrated a process from Workflow for 365, the list entry start object NAC gives me only has user ID available.
Given this, being able to retrieve the rest of the user's details via ID would be amazing.
Thank you very much for posting your feedback for our review. At this time, we will not be adding this request to the near-term backlog, as we are focused on other highly requested features. However, we reevaluate requests every quarter and will reach out if priorities change. Please keep the feedback coming as it is critical for our longer-term planning.
Hi Ben, when you say ID, do you mean the ID on the lookup field where a user is selected?