Why do I have to use MFA every single time I log in?

I'm curious as to why I have to authenticate every time I log into Constant Contant. I've checked all the reasons why my browser may not be recognized after logging off (Cookies being deleted, Private browsing, shared account login) and none of these are true in my case. I have one person added to the account as a manager, but she has her own login and password. According to a search I did, "The MFA cannot be completely turned off but you are not supposed to see this authentication every time you log in." I've tried different browsers, changing my password and still I need to have a verification code sent to me every time I log off and log back in! I called Customer Support and was basically told "That's just the way it is." Has anyone else experienced this and if so, is there a way to around this? It's very annoying and frustrating.