Allow specific websites that are blocked by Defender content filtering

Allow specific websites

It's possible to override the blocked category in web content filtering to allow a single site by creating a custom allow indicator policy. Allow indicators to supersede the web content filtering policy.

To define an Allow indicator, follow these steps:

In the Microsoft Defender portal, go to Settings > Endpoints > Indicators > URL/Domain > Add Item.
Enter the domain of the site.
Set the policy action to Allow.

More here:

https://learn.microsoft.com/en-us/defender-endpoint/web-content-filtering