Windows 10: Microsoft Defender SmartScreen reporting a SharePoint Online site is unsafe to SOME users

We are experiencing this for more than two months now.We are a US-based small business with established services including Office 365, SharePoint Online, Azure Cloud Services, etc with Microsoft.SharePoint Online site is used to collaborate with our global clients.Recently some of our clients reported that Microsoft Defender SmartScreen reporting our SharePoint Online site is unsafe. But the same link is working fine for everyone else. We even had people try the same link from the same geographical location and Microsoft Defender SmartScreen is not reported as unsafe.1. Why Microsoft Defender

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Microsoft Defender Smartscreen

Hi COLINGILBERT1,

Sorry to hear you're experiencing this issue. I'm an Independent Advisor and consumer of Microsoft products just like you. Let me help you with your concern.

Microsoft Defender SmartScreen checks downloaded files against a list of reported malicious software sites and known unsafe programs and against list of files that are well known and downloaded by many Windows users. If the file you downloaded is on the malicious
list or is not commonly downloaded it will show a warning, advising caution. If you believe that the file is not malicious and you trust the source then you can ignore the warning by clicking "Run anyway".

Refer to the below link for the benefits of Microsoft Defender SmartScreen.

https://docs.microsoft.com/en-us/windows/securi...

 

Privateemail.com reported as unsafe by Windows Defender SmartScreen

Hey VincentKie,

I'm not quite with Microsoft but hopefully I can help. Edge does return as this site being unsafe on my end as well, but I can access it just fine in Chrome. Maybe it was so that people reported this as an unsafe site through Windows SmartScreen, but in other
browsers you could access it just fine, their filters don't seem to make this site out as unsafe.

Hope that clears it up a bit.

 

What is this

That is Microsoft Defender SmartScreen in action.

https://docs.microsoft.com/en-us/deployedge/microsoft-edge-security-smartscreen


Note that the Soundestlink url in your screenshot is a redirection site, similar to TinyURL. It would more likely be that it is the site you would be redirected to that has been flagged as unsafe rather than Soundestlink, either because of unsafe code on that other site, or that other users have reported it as unsafe.