A user cannot start Event manager processes

A specific user account into Administrator group cannot start EM process

using 'unicntrl start opr', he get the following error messgae:

CAUGUI _ntfind(): OpenProcess of pid (2460) returned (ERROR_ACCESS_DENIED)

CCECS 11.2 SP2 CUM1 on win2012 R2 64 bits

This Windows account needs the following Advanced rights even if he is an Administrator account:

increase scheduling priority
take ownership of files or other objects
allow log on locally
create a token object
create global objects
increase a process working set
impersonate a client after authentication
increase scheduling priority
take ownership of files or other objects

Then the machine needs to be rebooted