Exchange Online is innately integrated with Azure AD, the same as Exchange Server integrates on top of Windows Server Active Directory. There aren't any special steps that you need to take in Azure AD first, Exchange Online/M365 will make any needed changes, create/modify users, etc as needed.
Integration of Azure Ad with Exchange Online

Gurudas
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Hello All,
Greetings!
We are planning to implement azure active directory and integrate it with exchange online, please let me technical process.
Thank you in advance.
Microsoft Security | Microsoft Entra | Microsoft Entra ID
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Danny Zollner 10,801 Reputation points Microsoft Employee Moderator
2022-02-28T04:53:43.033+00:00