the game is fine, okay even. do not attempt to contact ubisoft support, you will get a dozen replies from a dozen different people, and no one will
resolve your issue, particularly issues related to account linking and migration. a month will go by and eventually they will say the issue can't be resolved and say thank you for your understanding. They will not say why they can't resolve it. Say goodbye to your purchases, your cosmetic unlocks/rewards etc., you will not see them again. Cross progression is not as advertised, you've been warned. spend your money wisely, and somewhere else.