How to block web app access on personal devices through conditional access policies

Question

Hello, I'm trying to find a method to block users from accessing various O365 web apps on their personal devices.

Is creating a conditional access policy in Intune the best way to go about this?

We allow users to use the Outlook mobile app on a single unmanaged device but want to restrict them from using web browsers on personal devices to access stuff like our corporate OneDrive, Outlook and various other web apps. As a test, I created the following conditional access policy as shown below and applied it to User1. However, this user is still able to access Outlook web and OneDrive and all O365 web apps from his iPhone.
What am I missing? **

Conditional Access policy settings**

Assignment
Users - Specific Users included:

• User1

Target resource:

• Office 365
• Office 365 Exchange Online
• Office 365 SharePoint Online

Network:

• Any network or location

Conditions
Device platform:

• iOS

Filter for devices:
Include filtered devices in policy

• Device ownership = Personal

Access controls

• Block access

Answer 1

Hi Matthew, Welcome to MS Q&A

Under Enable policy, select On. By default, the policy is set to Report-only.

Please check attached Image and below URL for more detailed ref

https://learn.microsoft.com/en-us/mem/intune/protect/create-conditional-access-intune

Kindly accept answer if it helps,

Please let us know if any further questions

Thanks

Deepanshu

Answer 2

@Matthew Seah, Thanks for posting in Q&A. Please also ensure the client app under conditions are also set with "Browser".

https://learn.microsoft.com/en-us/entra/identity/conditional-access/concept-conditional-access-conditions#client-apps

And the policy is on.

If it is still not working, please look through the sign in log to see if the conditional access policy is applied.

https://learn.microsoft.com/en-us/entra/identity/monitoring-health/how-to-view-applied-conditional-access-policies

Hope the above information can help.

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