block Unsanction app in cloud

Similar queries as previously mentioned from one of the User; 

I'm just getting started with Microsoft Defender for Cloud Apps but have already worked a bit with it when it was still named Cloud App Security. Right now, I'm looking into the Cloud Discovery features. While trying out the Unsanctioned feature for some apps, I ran into the problem that they only get blocked if the user is using Microsoft Edge. If the user uses Chrome or Firefox, the app doesn't get blocked. I integrated MDCA with Microsoft Defender for Endpoint. What am I missing?

Does anyonce from Microsoft; kindly jump into and give guidance

thanks 

palash