None Cached Browser(llogin) 100% of the time

Hey Fellow Community Members, I have a question that I just cannot seem to find a good answer for. I have a customer that wants the user/pass to show up each time a user logs in. Sounds simple right....

What i mean by that is, I need it to not cache anything. I know you can set default ActivityBasedAuthenticationTimeoutInterval token to a lower setting, but I cannot figure out how to make it where it just expires once the browser closes.

The user can log into portal.office.com, click Mail, work, then close browser. When he goes back to portal.office.com, it just logs him in without asking for user/pass

Anyways, I am just looking for suggestions on how or what to do. We are testing around with some MFA settings and other parameters but I wanted to throw this out there to see what your great minds come up with.

Thanks in advanced for your help