Hi,
>>When I try to use the Instant Search in the top right corner to search
The Search People box, which is in the top-right corner on the Home tab, only works if you type the person’s name (or part of their name). You can’t use this box, however, to search for things like phone numbers or the customized filed as your case.
Try to use the "Search Contacts" field (above your contacts list), and see if it works.
Regards,
Ethan Hua
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