What is Confirm ?
Confirm is (verb) 1. to say that something is certain The dates of the concerts have been confirmed by the pop group’s manager. The photograph confirmed that the result of the race was a dead heat. We have been told that she left the country last month – can you confirm that? 2. to confirm someone in a job to say that someone is now permanently in the job to be confirmed in office to be told by a new management that you can still have your job
source: Easier English, Student Dictionary Upper Intermediate Level