When you search in a lookup field in CRM for tablets, it does not search any fields other than the primary field. For example, if the account number field is in your lookup view and set as a quick find searchable field, if you search an account/customer lookup field by account number, it won't find anything in the tablet app, but if you search for it in the quick find or a lookup in the web client, it works. I also opened a support ticket.

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