This indicates that the Microsoft account being logged into is different than the one used to migrate. For assistance with locating a Microsoft account, please reach out to their support at nitter.vloup.ch/xboxsupport or support.xbox.com ^AM

Oops! Sorry, apologies for misreading your tweet, I thought you said you hadn't. In that case, are you seeing a specific error message? Usually the wrong account is the case, but if you can provide us with an error, we can determine if it's a launcher/MS store issue or not. ^AM