Merge pull request #21279 from MicrosoftDocs/repo_sync_working_branch

Confirm merge from repo_sync_working_branch to main to sync with https://github.com/MicrosoftDocs/microsoft-365-docs (branch public)

Author: Stacyrch140

microsoft-365/security/office-365-security/attack-simulation-training-training-campaigns.md

@@ -108,6 +108,8 @@ On the **Target users** page, select who receives the Training campaign. Use the
     The number of results appears in the **Selected (0/x) users** label.
 
     > [!NOTE]
+    > Only Microsoft 365 groups are eligible to be selected.
+    >
     > Clicking the **Add filters** button clears and replaces any results the **User list** section with the **Filter users by categories**.
 
     When you have a list of users or groups in the **User list** section, select some or all of the results by selecting the round check box next to the **Name** column. The number of selected results appears in the **Selected (y/x) users** label.