I've shared a file in onedrive with a different user and used Office 365 management api to search for it.
I did find the event but I can see that TargetUserOrGroupType is always SharePointGroup (although I shared with multiple users) the TargetUserOrGroupName is SharingLinks.<some id>.AnonymousEdit.<some id> .
Why don't I see the name of the users I shared the file with?