Yep, I figured it out on my end before seeing your comment. I don't know what you have already tried, but this worked for me:
- Go to the EA Anti-Cheat site and redownload the installer
- Once installed, launch it and click the drop down arrow on the upper right. Select Battlefield 6
- Click Repair from the options below the drop down menu. It prompted me to select the file
- From your Files menu, select: This PC --> OS(C:) --> Program Files (x86) --> Steam --> steamapps --> common --> Battlefield 6
- Once the Battlefield 6 folder is selected, press "Select Folder"
After I did that, it looked like nothing happened. Closed the installer, tried the game, and it worked. Like I said, I don't know what you've tried yet. I also launch the game from Steam, so that's another consideration. Either way, I hope I could help!