Hi there. If you've read the article on Cross Save then you should know that purchasing Silver puts a 90-day lockout on your account in which you cannot disable Cross Save for security reasons, and that choosing the wrong characters when setting up Cross Save means you have to disable it and wait another 90 days before you can enable it again. I'm sorry, but there are no exceptions to these policies.
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During the Cross Save setup, you're asked which set of characters you want to use in Cross Save. You chose your Steam characters as your active account instead of Xbox. That's why it appears to have not worked—in reality, you just did it backwards. Regardless of what happened, the only thing you can do is wait out the Silver lockout, disable Cross Save, wait the deactivation lockout, and enable it again, making sure to choose Xbox as your Cross Save characters.