TABL in fedramp in what's new

Added a line in what's new section about releasing TABL in fedramp

Author: dhairyya

defender-office-365/defender-for-office-365-whats-new.md

@@ -41,6 +41,8 @@ For more information on what's new with other Microsoft Defender security produc
 
 ## July 2024
 
+- **Tenant allow block list in GCC, GCCH, DoD and and Office 365 operated by Vianet environments**: [Tenant Allow/Block List](tenant-allow-block-list-about.md) is now available these environments. They are on parity with the WW commercial experiences. 
+
 - **45 days after last used date**: The value **Remove allow entry after** \> **45 days after last used date** is now the default on new allow entries from submissions and existing allow entries in the [Tenant Allow/Block List](tenant-allow-block-list-about.md). The allow entry is triggered and the **LastUsedDate** property is updated when the entity is encountered and identified as malicious during mail flow or at time of click. After the filtering system determines that the entity is clean, the allow entry is automatically removed after 45 days. By default, allow entries for spoofed senders never expire.
 
 - (GA) Learning hub resources have moved from the Microsoft Defender portal to [learn.microsoft.com](https://go.microsoft.com/fwlink/?linkid=2273118). Access Microsoft Defender XDR Ninja training, learning paths, training modules and more. Browse the [list of learning paths](/training/browse/?products=m365-ems-cloud-app-security%2Cdefender-for-cloud-apps%2Cdefender-identity%2Cm365-information-protection%2Cm365-threat-protection%2Cmdatp%2Cdefender-office365&expanded=m365%2Coffice-365), and filter by product, role, level, and subject.