Microsoft 365

Disclaimer: Since you are using English language for this post, I will respond in the language you are using. As this is the Taiwan forum, you are welcome to let me know if you need me to respond in the language of the forum. I respond in the language you are comfortable with. 

Hello Wai Ling Linda Lee

Since keys 1 and 4 worked but keys 2 and 3 did not, please try redeeming the affected keys individually at:

https://microsoft365.com/setup

Make sure you sign in with the Microsoft account where you want the subscriptions registered. Please do not post any product keys publicly.

If an error says that the key was not activated at the time of purchase, Fortress HK must activate or replace the affected key. If you receive another error, please share the exact error message or error code, without including the product key.

You can also contact Microsoft Support here and provide your proof of purchase and the error message:

Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.  

1. Open a website link - Contact - Microsoft Support 
2. In the box below "We're here to help", type Microsoft 365, click "Get Help", and then click "Contact Support" below. 
3. In this section, you will need to sign in to your Microsoft account. 
4. Select "Microsoft 365 and Office" under Products & Services, select "Technical Support" as the category, and click to confirm 
5. You can select " Chat with a support agent in your web browser " to access the chat window. 

Please note that Microsoft Q&A is a public community and cannot check or validate product keys directly.

I hope you can get the support you need,

have a nice day.