This vaccine is still unapproved, meaning it's being used experimentally at this point. It has not been approved nor completed normal testing trials. Otherwise it wouldn't have had to receive emergency use authorization.
> An Emergency Use Authorization (EUA) is a mechanism to facilitate the availability and use of medical countermeasures, including vaccines, during public health emergencies, such as the current COVID-19 pandemic. Under an EUA, FDA may allow the use of unapproved medical products, or unapproved uses of approved medical products in an emergency to diagnose, treat, or prevent serious or life-threatening diseases or conditions when certain statutory criteria have been met, including that there are no adequate, approved, and available alternatives.
https://www.fda.gov/vaccines-blood-biologics/vaccines/emerge...