Tried again today. This time just moved a few units and tried to save. Same ERROR [99} but with no option for retry and then game froze there. I had to use Task Manager to even exit game.

No connection issue. Everything else works fine. I tried 6 times last night and finally gave up.
Without any way to save the game, I lose all I did and have to start over when I shut down my PC.
Any other advise?