@svjs-0437 Thanks for posting in our Q&A.
For this issue, I have done a lot of research. I find that HMA enables both Intune App Protection Policies (also known as MAM) and Conditional Access through Outlook Mobile for Exchange on-premises.
If we want to use HMA, it is needed to meet the prerequisites in the following article:
https://learn.microsoft.com/en-us/microsoft-365/enterprise/hybrid-modern-auth-overview?view=o365-worldwide#do-you-meet-modern-authentication-prerequisites
Hope the above information will help.
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