Hello,
Cannot say how much win 11 is different, but I still suppose that the issue can be caused by something else rather than the system itself. We have players with win11 and they can access the game.
Therefore I am still suggesting you to check the following "guide" for this error and to follow the steps (to the possible extent surely).
a) Disable Startup of Third-party App:
Jointly hold Windows & R hotkeys -> In the void box type "msconfig" -> OK -> switch to the Services tab and mark the Hide All Microsoft Services checkbox present at the bottom ->click on Disable All button.
Then go to the Startup tab and click on Open Task Manager -> select the 3rd party applications running within the PC and hit the Disable button -> OK.
b) Whitelist the game in all your antimalware programs (including standard windows defender) and firewalls
c) In Windows 10 disable kernel isolation:
Search bar -> type "run" and open the application -> type regedit -> OK
Search for HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/DeviceGuard/Scenarios/HypervisorEnforcedCodeIntegrity and change the parameter Enable from 1 to 0
Reboot the PC
If the upper fix doesn't help, then the problem is caused by some new Windows update.
In this case you need to delete that update:
Settings -> Update and Security -> Windows Updates Center -> Update history
Delete the update from the screenshot below and the other updates from the same date (your date may differ).