Now that I logged into Office 365 on my Windows 10 laptop using my Waterloo email, I am forced to make a NEW PIN (6 digits). Why???

After logging into Outlook with my uWaterloo email account, I tried to sign into my user account; I was then prompted to make a new pin that was 6 digits long, not the 4 that I'm used to: "This organization requires you to make a new pin." So far I've been logging in with my long-ass password, but it is quite cumbersome and I would love to have my old pin back. I don't want to make a new pin. I surely don't want to make a new 6 DIGIT pin. Why tf is uWaterloo making me do this, and how do I stop it? Thanks.