how to block the Outlook desktop app while allow them use the Outlook On the Web (OWA)

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I want to block users access to outlook from Outlook Desktop Application but let them access outlook from Outlook on the web (OWA) to improve security.

Is there someone who knows how to achieve the goal?

Thanks in advance.

[#2 · Accepted solution]

You can use a Conditional Access policy to block desktop apps.

Assignments

Conditions > Client apps > Mobile apps and desktop clients

Grant

Block Access