Is there an error message or error code that you receive? I was able to get into the game and adjust settings but initially it said that I didn't have secure boot enabled when I did. It turns out the secure boot on my ASUS board was on "other OS" because I dual boot and when I changed it to Windows UEFI then BF6 would launch fully.
alreayd did that before, not the problem for me. Also the previous linked fix didn't change a thing. I don't get any error messages, it loads the small BF6 image you get starting the beta from Steam, for less than a minute, and the game closes itself on Steam. No error code whatsoever.
I seems the problem may be very likely the anticheat not working, not my rig for sure,. it is way above the required specs in hardware, I run an Nvidia 4080. Hope they fix the issues in time for thursday, or I'm thinking about cancelling the preorder, I don't want to spend 100 € on something I can't use.
