Microsoft Security | Intune | Application management
Managing apps and software deployment through Microsoft Intune
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Is it possible to block users from accessing the Microsoft Store, and not break Intune Store app deployments?
As you can see in the link below, having the store app blocked with GPO breaks the ability to deploy store apps with Intune.
Yes, use the "Show private store only" policy setting: https://learn.microsoft.com/en-us/windows/configuration/stop-employees-from-using-microsoft-store#show-private-store-only-using-group-policy.
The information given in the thread you referenced above is not accurate and is misleading.