Hi Michael,
Please use this cmd on the SFB server management.
Set-CsClientPolicy -identity Global -SearchPrefixFlags 255
If you set the SearchPrefixFlags 255 ,you can search users by following items
Primary email address
Email alias
All email addresses
Company
Display name
First name
Last name
If you want to know more details about this cmd ,please open
this thread.
Best Regards,
Leon Lu
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