If looking at the audit trail you see 'Application Exception Accepted' this means that when the applicant made their application, a duplicate record was created in the ECB's system rather than the application overwriting and updating the existing record we hold for them.
This sometimes happens as the existing data we hold for people can become out of date – the system recognises this and creates a duplicate record with the new info in order to trigger us to check that the new application's data is correct. Sometimes this can involve contacting the applicant to ensure we have the correct information. 99% of the time a duplicate is created it is fine and we simply need to merge the two records keeping the new info. 'Application Exception Accepted' just refers to this process being complete.