You are wanting to use the native iPhone email and calendar.
Click on Settings, Mail, Accounts, Add Account, Exchange.
Input your email address and your password
If 2FA or multi-factor authentication has been enabled - then this would be your app password. If you have forgotten it, you can create a new one. Check out this blog on how to create a new one.
If it asks for server name, use “outlook.office365.com”
Leave domain empty.
Don’t forget to change Mail Days to Sync if you want 1 Month.