Hello Lioxyze.
Can you please try the following?

• Check the network settings on the Xbox itself. Make sure there are no issues like NAT type restrictions, and run a detailed network test from the Xbox settings.
• Ensure there are no parental controls or age verification restrictions that might be blocking the game.
• Reset the console's network configuration. Sometimes, this can clear hidden issues.
• If none of this helps, a factory reset of the console (without deleting games and apps) might be a good last step.