Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello, I'm Quinn and here to help!
Just a quick note, this forum is a user-to-user forum, no one here has any account access. Normally, once a product key is redeemed, it becomes linked to the Microsoft account used at that time. Try redeeming the product key using your new Microsoft account at https://setup.office.com.
If the key has already been redeemed, you’ll need to contact Microsoft Support. Let them know that your previous email domain is no longer available, and they can guide you through the process of verifying your purchase and, if possible, moving the license to your new account.