Through your feedback, we have confirmed that yesterday’s update fixed many launch crash issues on Xbox and Xbox Cloud Gaming; however, there are still some some instances of users stuck in a crash loop cycle. We have just released a new update for those participating in the Microsoft Flight Simulator Beta on Xbox Insider Hub to help us test and verify a further fix.
You should receive an update automatically the next time you launch the sim, but if not, check the Xbox Insider Hub and select Show in store to install the update manually. You may also need to restart your console for the update to appear.
Please leave feedback on this update here. Thank you!