You now will have the possibility yo leave a guest tenant (https://docs.microsoft.com/en-us/azure/active-directory/b2b/leave-the-organization).
In this how to i will show you how to do this.
Go to the MyApps portal and login with your Office365 Account Go to your profile (right corner) and click the settings icon. Below Organizations you will see the tenants listed where you have access to Click the organization you want to leave. You will now automatically login to the tenant.
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