Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Judith,
You cannot enter the product key again - since it is already used.
Simply go to https://account.microsoft.com/services/ and install from there:
I hope this information helps. If you have any more questions, don't hesitate to reach out.
Otherwise, please take a moment to rate the answer. Wishing you good luck!