Assuming it still works in the modded realm, it’s more likely to be related to Easy Anti-Cheat. Then again, this Telekom issue has resulted in all kinds of weirdness, so I wouldn’t rule it out completely!
Could you please ensure the Easy Anti-Cheat service isn’t disabled by:
- Open the Command Prompt as an administrator
- Enter the command:
services.msc - Locate Easy Anti-Cheat within the list and double-click it
- Change ‘Startup Type’ to ‘Manual’ if it’s set to anything else