Yes; if you have received a degree from a university, you must supply us with a copy/scan of the diploma/degree certificate. Otherwise we may not be able to prove the degree was conferred.
In the event that you cannot obtain your degree certificate, if your transcript states that you received the degree, that is generally acceptable for evaluation purposes. If you cannot obtain your degree certificate and your transcript does not state that you received the degree, we will need to obtain verification from your university that you graduated and the degree was conferred.
You can check our Country-Specific Document Requirements HERE