Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello, thank you for reaching out to Microsoft Q&A.
Could you please try redeeming the key using another web browser or in an incognito/private browsing mode?
Open a private browsing window in any web browser and go to:
https://setup.office.com/redeem/enter-key
- Click Get started and enter your 25-character product key.
- Sign in with your Microsoft account and redeem the product key.
If the product is already added, you can visit the Microsoft account Services & Subscriptions page to check if the subscription is associated with your account.