How to connect the office 365 interface in your account?

Question

Active Directory

Good day everyone!

1. There is a site of an educational institution on SharePoint with authorization on it through the institution's AD;
   
2. Have an Office 365 plan 1 subscription
   
3. AD synced with Office 365 (student accounts)
   

The question is as follows: when a student authorizes on the institution's website and goes to their personal account, the Exchange Online interface should be loaded in the iframe. Those. in your personal account in the mail section, there should be an Office 365 mail interface.