Hi,
Event 4724 :This event generates every time an account attempted to reset the password for another account. This is the account audit policy user for the security reason to monitor who changes the accounts in the domain.
Event 4742:This event generates every time a computer object is changed.
Based on my research,
a. MediaAdmin: Service account used by Windows Server Essentials Media Streaming Service during configuration
b. ServerAdmin : Service account used by Windows Server Essentials Management Service during configuration
If possible, would you pleas share a screenshot of the events.(You can hide the private information)
Best Regards,