If you think your account has been compromised, the first step is to change your password by logging in to a school computer while on the school network and hitting ctrl-alt-delete and selecting "Change Password," then walking through the password reset process.
Following the password reset, go to the link below and click on "Sign Out Everywhere" to initiate a signout of your Microsoft account on all computers and phones it's currently logged in to. Note that there is a link here to Change password... however, please note that since our passwords sync from our school network this won't work -- if you change your password with this method, it will revert to the old password within about an hour.
https://account.activedirectory.windowsazure.com/r/#/profile
If you feel your account has been compromised, you should also check your mailflow rules to make sure the attacker hasn't set up a method to continue exfiltrating information from your account.
