I'm using MS Project online, and I have a "ProjectOwnerName" and a "ProjectOwnerID"

I want to find the associated email address for this user. Now I can match on name, but it's not robust. So I would prefer to use this ProjectOwnerID. But I cannot find what it connects to.


Using PowerQuery to explore the API, I see tables within tables within tables. In the little that I have managed to explore, I cannot find a matching key for "ProjectOwnerID"

Where can I find a ERD or a shortcut to exactly this?

1 Answer 1


You can use the following api to get the email


You can also use


You can also try looking at _api/SP.UserProfiles.PeopleManager/GetUserProfilePropertyFor ....

  • Thanks but my question is more around the GUID style field called ProjectOwnerID. And what that field represents and links to.
    – Maxcot
    May 25, 2022 at 2:54
  • you can pass the the ProjectOwnerID in Filter example ProjectOwnerID = 82 site_url/_api/Web/SiteUserInfoList/… ID eq 82
    – Saira
    May 25, 2022 at 4:10
  • I'm just getting an error <m:message xml:lang="en-US">The field or property 'ProjectOwnerID' does not exist.</m:message> The ProjectOwnerID as a fieldname won't exist in the SharePoint list. It will be under a different name. But what?
    – Maxcot
    May 25, 2022 at 22:05
  • what is the api that you are using ?
    – Saira
    May 25, 2022 at 22:09
  • https://....sharepoint.com/sites/..../_api/Web/SiteUserInfoList/items?$select=ProjectOwnerID
    – Maxcot
    May 25, 2022 at 23:32

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