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Hi, VLOOKUP only available on Custom Objects. Vote for this idea:
VLOOKUP only available in Validation Rules.
VLOOKUP can only be done on the Name fields.The field_to_return must be an auto number, roll-up summary, lookup relationship, master-detail relationship, checkbox, date, date/time, email, number, percent, phone, picklist, text, text area, or URL field type.The field_on_lookup_object must be the Record Name field on a custom object.The field_on_lookup_object and lookup_value must be the same data type.Hope this helps.Kindly mark this as solved if the reply was helpful.Thanks,Nagendra