Hi @LeonidS

Thanks for the reply. I have found the problem and fixed it. I didn't realize that I was trying to set Operator role on suspended accounts. That's why the 'Set Operator role' option was not showing. For unknown reason, all my accounts on my dev site went suspended. I can't figure out how and why. After activating them again, the 'Set Operator role' menu action was back. Thank you.