I am trying to update the contents of a person or group field of a specific item in a Sharepoint list. However searching through the docs I could not find any examples, so I created a flow that does just that to take a look at the code. Pasting the code into MS Graph Explorer returns a 200 but does not change anything. Updating fields like the title, links or whatsoever work. I am using a PATCH request with the url:
and the following body:
"Claims": "someuser@Company portal .com"