Looking through the Event Logs on a Windows Server 2012 R2 Hyper-V host I could see multiple entries for event IDs 17140 & 15030 as below
17140 – The specified account name is not valid: ‘%USER SID%’.
15030 – ‘%SERVER NAME%’ failed to modify settings. (Virtual machine ID %VM ID%)
These errors can occur if you’re using System Center Virtual Machine Manager (SCVMM). In the SCVMM console, open Settings -> Security -> User Roles. Right-click on each user role and choose Properties. Open the Members tab and look for the user SID you see in event ID 17140.
Highlight the SID and click Remove.