Unable to fetch Author Details

Question

Hello,

I am using the Microsoft Graph API to retrieve a SharePoint list item along with all its fields (properties) using the following request:

https://graph.microsoft.com/v1.0/sites/{siteID}/lists/{listID}/items('{itemID}')?expand=fields

This request returns the list item successfully; however, for fields such as Author, Editor, and Person fields, the response only includes the lookupId rather than the user details.

I recall that an additional GET request is required to retrieve the full user information, but I cannot remember the exact API call needed to do this.

Could someone please help me with the correct API request to fetch the Author, Editor, and Person field details? body: { ....

JSON

"fields": {
            "@odata.etag": "\"XXX,XXX\"",
            "PersonLookupId": "15",  // User Details
            "Certification": [
                {
                    "LookupId": XXX,
                    "LookupValue": "XX"
                }
            ],
            "Expires": "XXX",
            "Issued": "XXX",
            "Status": "XX",
            "id": "XXX",
            "ContentType": "Item",
            "Modified": "XXX",
            "Created": "XXX",
            "AuthorLookupId": "15", // User Details
            "EditorLookupId": "577", // User Details
            "_UIVersionString": "1.0",
            "Attachments": false,
            "Edit": "",
            "ItemChildCount": "0",
            "FolderChildCount": "0",
            "_ComplianceFlags": "",
            "_ComplianceTag": "",
            "_ComplianceTagWrittenTime": "",
            "_ComplianceTagUserId": "",
            "AppEditorLookupId": "9"
        }

.... }