Immortals Fenyx Rising Trainer is also currently purchasable in Epic Games, althrough i might try not buying from there as people have been buying games from there and not launching correctly. I'm guessing the epic launcher is the one causing the problems and of course you know epic games they do not update/fix their stuff until the huge update comes.
The simple trick is to have both epic launcher and ubisoft connect already launched and open.
The fault is actually on ubisoft connect as it checks on updates first and then forgets the original command that called it.
Steam usually overcomes it by continuously calling the game.
Cheers
🙂