I have tried every thing me and my friends could think of no matter what every time i reinstall halo infinite insider it dose not work and i have campaign xbox insider live gold internet i cant think of a reason why it wont work
Does anything in here help:
https://insidersupport.halowaypoint.com/hc/en-us/articles/7623367397268-Network-Co-Op-Flight-Xbox-Installation-Instructions
If not, then if you provide some details of what is happening (does it launch/error messages/missing features etc) someone on here may be able to offer some help