During Azure AD synchronization, some returned messages regarding group removals might not be parsed correctly, resulting in the synchronization failing with an exception like:
- Azure AD is returning soft-deleted Groups where the JSON group object is missing the displayName field
- Azure AD only purges soft-deleted Group Information after 30 days
- In some cases disabling incremental synchronization, or recreating the affected directory in Crowd might alleviate this.
- Permanently purge the soft-deleted group information from Azure Active Directory prior to the 30 days by following the workaround described in Crowd Synchronisation with Azure AD fails with "java.lang.IllegalArgumentException: name argument cannot be null or blank" KB article