Our teams are investigating potential software conflicts that can affect performance, general game stability, and being able to launch Forza. The game does not explicitly support certain programs and may even see specific applications/software as a conflict or threat and, as such, refuse to run, or run with crashes.
You may want to try disabling or updating the exceptions on your antivirus or firewalls to see if this improves your experience.
Below are some of the more common antivirus and guides on how to add exceptions