Sophos UTM 9 (SG135) web protection reporting

Hi Just wondering if anyone is able to assist.

I am trying to pull down some reporting on my sophos device for a particular user. I can see all websites visited within time period. Unfortunately, when I filter it down by user, the closest it brings down is the IP address of the device instead of the user name.

Is there any way around this to show which user (by name) it was rather than IP as IP's can change at any time.

Thanks