Why is it defaulting to a different account?

I have a Microsoft account through school.  I also have a Microsoft account at work.  When I log into Smartsheet using my work email, it automatically defaults to my school address and I can't access all of my projects at work.  I have signed out, restarted, it will not log into my enterprise account.  Help!!!  I have a meeting in 20 minutes and can't access all of the work I've done up to now.