CSOM User field: Email property is always null starting on 12/15/2025

[DansGithubAccount22]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

CSOM 16.1.23710.12000

All of our code to fetch a user and get their email, the email is Null. This started happening today. I have seen other reports online of people facing the same issue

var listItems = await _listRepository.GetListItemsAsync(clientContext, "MyUserList", camlQuery);

var userName = item[SharePointListColumns.MyUser] as FieldUserValue;

MyEmail = userName.Email ( Now returning null )

Steps to reproduce

1. Create a list in SharePoint with a user field
2. Run .Net CSOM to pull the items from the list
3. Try to read the email field

CSOM library package version
Microsoft.SharePointOnline.CSOM.16.1.23710.12000

Expected behavior

Use's email is populated

[DansGithubAccount22]

Looks like a known issue - SP1196502

[Ashlesha-MSFT]

Hello @DansGithubAccount22,
Thank you for bringing this issue to our attention. We will look into it and get back to you shortly.
If you don’t receive a reply within two working days, please use this escalation form to escalate.

[Ashlesha-MSFT]

@DansGithubAccount22,
Thanks for reporting this!
This appears to be the same underlying issue as #10527 , .
To keep tracking centralized, I'm closing this issue as a duplicate.
Please follow #10527 for updates.
Thank you for your contribution!