Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
Are you using Office on a Windows device?
If so, open Word.
Go to File - Account.
On that window, is there a 'Switch Licence' button?
If so, click that button and in the resulting list, are you able to switch Office to your new Office 2024 licence?
2
If you are using Office on an Apple Mac:
Use the steps on this link to remove the previous Office licence from your Mac:
Then log into the Office apps with your Microsoft account used for the new Office 2024 licence.