This has been reported before here.
https://www.flyertalk.com/forum/marr...t-account.html
Originally Posted by
rylan
On top of that, their 2FA isn't even implemented properly. There is no way to 'remember this browser/computer' like almost every other site with 2FA on the planet, which when selected will stop prompting you for the 2 factor login code for a period of time (usually a month or two).
For some reason, Marriott seems to activate 2FA for no reason, but it takes just a few seconds to turn it off in your profile. It’s been activated twice on my account in the last 6 months, and I’ve turned it off twice.