When I am on a record page, DC Live shows 'Record cannot be found'.
This can have two causes:
1. The record does not meet the Object Filter Criterium
This is caused when the record does not meet the filter criterium that is configured in the Object Filter. Adjust the filter if the record should work with Duplicate Check. See Object Settings for information about the Object Filter.
2. It is a converted Lead record
Lead records that are converted (the 'isConverted' field has value TRUE) are not analyzed by Duplicate Check.