Microsoft Defender for Cloud Apps evaluation

Hi all,

I'm currently playing with Cloud Apps.

I would like to block Virus Total (for testing purpose).

From the Dashboard, I can see all the discovered applications for a specific device.

I tagged VirusTotal application as Unsanctioned but the application (accessed using a web browser) is never blocked... 

PS: I have Microsoft Defender for Business license

PS: I enabled Microsoft Defender for Apps in Settings -> Endpoint -> Advanded Features -> ON (Microsoft Defender for Cloud Apps).

Any idea ??

Regards,

HA