Previously, when running Azure BackSync (or any Update sync workflow that used the Azure AD Connector) to synchronize group members after making changes to a group, Azure BackSync (or the sync workflow) failed with the following error: One or more added object references already exist for the following modified properties: 'members'.
This issue occurred because used expand queries to retrieve Azure group members (and object reference type attributes in general) with two limitations:
As retrieved only the first 20 member objects, Azure BackSync or the Update sync workflow could run into data synchronization anomalies, such as trying to assign an object to a group where it was already a member.
The issue was fixed by removing the previous limitations of the expand query, so that it can retrieve every member of a group (or every other object reference type attribute). This fix affects the following object reference type attributes:
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