I have a SharePoint Online list with multiple people fields, including one for Project Manager. Using PowerShell graph module commands, or the graph APIs directly, if I retrieve a single list item where this field is populated I can retrieve the Project Manager Lookup Id from the field list. However, if I retrieve all list items at once, this field is not included for any of the returned list items and I don’t know why.
I’ve tried several variations of the expand-property parameter with no luck.

I’m using an API to retrieve search results along with item metadata. But I’m encountering an issue where results from a custom column aren’t being returned.