Miscellaneous topics that do not fit into specific categories.
If you already purchased Microsoft 365, the license is tied to your Microsoft account, not the email message. On the other computer, sign in at https://account.microsoft.com/services using the same Microsoft account you used to buy Microsoft 365, then choose Install. This is the official way to reinstall on another device. https://support.microsoft.com/en-gb/office/download-install-or-reinstall-microsoft-365-or-office-2024-on-a-pc-or-mac-4414eaaf-0478-48be-9c42-23adc4716658
If you bought a product key card or a one-time code, you can redeem or check it at https://setup.office.com
If you cannot see the subscription after signing in, it usually means a different Microsoft account was used for the purchase.