Hello! We cannot assist players with recovering Microsoft accounts, nor can we transfer purchases between Microsoft accounts. Please contact Microsoft Support for assistance recovering the account: msft.it/60129c6Vs -AG
You'll need to reach out to Microsoft Support for account recovery options, at msft.it/60189iWok or through their help site directly: msft.it/60199iWoZ. ^FF
Thank you for your patience. Receiving error 403 while attempting to register a public account is often associated with a connection issue that involves your ISP (Internet service provider). Please contact your ISP to see if they can help resolve the connection issue. -AG
Mojang's ToS/brand guidelines describe what you can and can't do with Mojang's games/brand/assets. msft.it/60129igPG (more info here: msft.it/60139igPH). If anything is not covered or not understood, we advise you to seek legal counsel. -AG
We at Minecraft Support cannot assist with recovering Microsoft accounts. We can only recommend that you reach out to Microsoft Support again for assistance recovering your Microsoft account. -AG
Hello. The post-migration steps do not apply to players who have a purchase of Minecraft associated with a Microsoft account. If you use a Microsoft account to play Minecraft, no further action is required. -AG
Happy to help! In fact, I was taking another look, it does look the bug you're getting is getting grouped under this bug report: msft.it/60179igHR. A support agent may likely direct you to this page, as well. In the meantime, we thank you for your patience. -AG
We recommend writing to our Marketplace team at msft.it/60199idsl, so we can assist you further! Please be sure to include your full Microsoft Gamertag and the name of the item you're missing. -AG
Understood. Would you be so kind as to try resetting your browser's cache or perhaps trying to register with another web browser or device? We also recommend restarting your device, in case you can register afterward. -AG
You'll likely have received a response in your email inbox that contains information such as your ticket number. Would you be so kind as to provide it? Once we have your ticket number, we'll be happy to check on the ticket for you. -AG