devtrackers.gg
I just installed the game yesterday because I decided I wanted to play it again and when I launched the game I got an error code Mike-01 but there was no scheduled maintenance. I read somewhere that it could be that Ubisoft doesn't recognize my save game data so it just never loads.
Sorry to see you're experiencing this.
Can you go through the steps in this link, especially the part about port forwarding
If you still have the same problem after this, can you please send us screenshots clearly showing your ports forwarded as advised in the steps via Twitter DM or Facebook PM.