If you cannot see any game lobbies when you join the Multiplayer lobby browser, there may be a few issues:

🛠 Make sure you have enabled CROSSPLAY. 
In the in-game Options menu, go to the Game Options tab and ensure that “Allow Cross-Network Play” is checked. All players attempting to join the match should check this.

🛠 Make sure you are on the latest game build.  If an update was released recently, you will need to be on the latest build to play with the rest of the community. Information about the latest build can be found in the Patches, Updates & Content Releases category of our news. 

🛠 Make sure your local or campus firewall is not blocking connections.  Make sure the game is allowlisted, so it doesn’t get blocked in the matchmaking lobby. For the base Windows firewall, follow Add an exclusion to Windows Security

🛠 Sync your PC clock. If the clock is even slightly off, it can interfere with connection to Live Services

🛠 Microsoft Store: Check your account & privacy settings to ensure you are set to online and open for multiplayer

• Xbox Account Settings
• Privacy and Safety Settings

🛠 STEAM: Ensure that your Steam account is public and is not hidden or offline.