After logging into my xbox account, I am stuck on the log in screen
Screenshot:
I would file a support ticket about this
https://insidersupport.halowaypoint.com/hc/en-us/articles/360039257312-How-to-Use-the-Insider-Halo-Support-Site
You have Xbox App services disabled, even though the flight is through steam. Go in and enable it in task manager and you should be able to play.