please any one can help ?

There are no current server issues being reported: https://rainbow6.ubisoft.com/status/

So, hopefully the above suggestions will fix your issue!

try restarting your router and Power Cycling your Xbox.

turn off your router then unplug the power for 5 minutes.

hold the power button on your Xbox for 10 seconds then unplug the power for 5 minutes.

start the router first and wait for it to fully initialise (all the lights are green) then start your Xbox.

hope this helps

Id power cycle both your router and your xbox and hopefully this will resolve. Failing that, start a chat with xbox support and they may be able to offee further advice.

I hope you manage to get this issue resolved

You should be able to change it from the settings menu on your Xbox. It would be under" Account" and I believe account security. From here, you can select Microsoft account and change the account that is linked to your gamertag. If this does not work, and
there are no other correct solutions in this thread, contact xbox support at the link below:

https://beta.support.xbox.com/

Hey there DanielBowen2,

Thanks for reaching out to the Forums for clarity on working with an account situation like this. I can totally see how this could seem like an urgent issue that you would like to get dealt with in a timely manner. The closest thing to any kind of transfer
of a Microsoft account would be to change the sign in email for it as outlined in Change the email address
or phone number for your Microsoft account.

After you make the change (which may take time to take effect), it would be best for you to remove your ex's old information.

Hope this helps.

Thanks for reading!