To all fellow simmers. I really feel your frustration here, especially for xbox. One thing I can advise is to scroll through the questions for the next Q&A and upvote everything that you recognize and find important to ask. Or even create a new topic there. Good luck and I sincerely hope they will be able to solve the issues before the weekend.
Seems it’s happening! Jayne says:
We have identified the specific crash instances and plan to release a hot fix as quickly as possible (we are targeting Friday) to get Xbox and Xbox Cloud Gaming users up and running again.
For those currently unable to launch on Xbox Series X|S due to World Update IX, we have just released a beta build to the Xbox Insider Hub
All to be read here