ZohoAssust account security issue

ZohoAssust account security issue

24 hours ago I logged into my ZohoAssist account making sure not to trust the browser. When I was finished I did not log out but simply closed the tab. For 9 hours the browser was closed yet today I was able to get back into my ZohoAssist. This account has MFA enabled but that is only being prompted for if I remember to log out of the account.