Create item with Person or Group column with HTTP request in Power Automate

Question

I am struggling with creating a new list item with Person or Group column via HTTP request in Power Automate while using claims of the users. I can't get the syntax to work.

I was able to create workaround updating (not creating) item that works, but with this I need to create empty item before my workaround below.

Any idea how to make it works for create item HTTP Request?

My current HTTP request:

Method: POST
    
Uri: _api/web/lists/getbytitle('LISTTITLE')/items(123)/validateUpdateListItem

Headers: <none>
Body:
{
    "formValues": [{
        "FieldName": "AssignedToMultiSelect",
        "FieldValue": "[{'Key':'user_claims'}]"
    }]
}

Answer 1

To add items use AddValidateUpdateItemUsingPath instead of ValidateUpdateListItem.

You should use the following formats for the FieldValue property for People or Group fields. The Key property value should be 'i:0#.f|membership|' plus the user's email address.

With single select: "FieldValue":"[{'Key':'i:0#.f|membership|[email protected]'}]"

With multiple select: "FieldValue":"[{'Key':'i:0#.f|membership|[email protected]'},{'Key':'i:0#.f|membership|[email protected]'}]"