Multiple Accounts in Streams

I have the same issue. I cannot log out of my school account. I have tried logging out, and closing the browser, but when I log in again, it logs me in automatically to the school account, it doesn't even ask which account I want to log in to. When I click on account and then log in to a different account, an error appears stating that the work User account from the school's identity provider does not exist in the school's tenant and cannot access the application (My Profile) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.