You cannot Unable to launch multiplayer session because of how your Microsoft Account is...

Hi there Thomas, my name is Gerardo, and I'm an Xbox player, just like you. I'll be happy to assist you with any questions or concerns you may have.

Don't worry, it appears to be a problem that is affecting everyone in Fallout 76, and the game developer (Bethesda) has already announced through their official Twitter that they are aware of the issue and are investigating it to resolve it as soon as possible, as you can see for yourself through the following link:

https://twitter.com/BethesdaSupport/status/1719027905517236485

Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

I appreciate your understanding, and let's hope it gets resolved soon.

Kind regards,
Gerardo.

Happy to help you.
If you have more problems, contact us.

Hello RelaxingBat2683, My name is David. I am an independent advisor, happy to help you today.

You can try to fix the problem by following these steps.
Check your account privacy settings. This may be an issue related to the privacy settings of your Xbox Live account. Make sure your privacy settings allow access to the multiplayer game. You can check and adjust your privacy settings on your account privacy settings page on the Xbox website or through the Xbox One console.

Clear the cache on your Xbox One Cache buildup on your console can cause connectivity issues. To clear the cache, turn off your Xbox One, unplug the power cable from the back of the console, and wait at least 10 seconds. Then, reconnect the power cable and turn on the console.

Best regards.

Restart the console: Press and hold the Xbox button on the console for 10 seconds, then unplug the power cord and wait 10 seconds. Reconnect the power cable and turn on the console by pressing the Xbox button again.

Thank you! this suggestion fixed the issue I was having.

Restart the console: Press and hold the Xbox button on the console for 10 seconds, then unplug the power cord and wait 10 seconds. Reconnect the power cable and turn on the console by pressing the Xbox button again.

Clear save data: Clearing Fallout 76 save data may resolve some errors on the console. Please note that this will delete all saved photos and they cannot be restored.

Check network connection: Make sure your console is connected to the network. If necessary, select “Test Network Connection” to obtain a diagnosis.

Thank you for your kindness and understanding! Please feel free to let me know if you need anything else.