I just found out about CNC online from a friend and I've had the game through origin for a couple years now. I have Windows 10, Origin (with Ultimate Collection). I looked through the common issues post and tried some of them (setting compatibility mode to XP Service Pack 2). I still haven't been able to get this to work. All it read when i try to sign in is that "Could not connect".
Heres the %TEMP% log thing.
----- C&C:Online Launcher Start -----
Game: Red Alert 3
Red Alert 3 Install Path: C:\Program Files (x86)\Origin Games\Command and Conquer Red Alert 3\Red Alert 3\
Started game with: ""Red Alert 3\RA3.exe""
Caught CREATE_PROCESS_DEBUG_EVENT from Red Alert 3. Detaching...
Found game.dat process. PID 29136
*** Starting CA public key patching routine ***
CA public key is expected value.
Successfully patched CA public key.
*** Starting hostname hooking routine ***
Injecting DLL into game.dat process...
Result of injection: Code -1073741582