Hi Am230089,
Based on my research, it is not supported to add/map a user or a group to all users’ SFB client in the Server side or online by Microsoft. You could only let users to search the user ID or the distribution group and then add them as the contact list.
About this, I suggest you could post a feedback in the
SFB feedback website. Microsoft will improve MS products based on the feedback and hope this problem will be solved in the near future.
Best Regards,
Evan Jiang
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