'This product is already installed on another device' message issue

There is Microsoft Video to activate pre-installed office

https://www.youtube.com/watch?v=zetZh7zGgOA

I think, in HP offline store, it was activated the same way mentioned in the video.

There is no product key, I called HP offline store, they informed the same, no product key is needed to activate pre-installed office, only outlook account details is enough

Did the following actions

1. Quick Repair
2. Online Repair
3. Uninstalled and installed again
4. Uninstalled --> Restarted the system --> Installed again.

Mine is Microsoft Office Home& Student 2019.

Note:

It was included in my laptop and it was activated using outlook account when I purchased HP laptop. When I purchased laptop from offline store, they didn't give me any product key for office.

I created new outlook account while purchasing laptop.

For few days it was working, from yesterday (27/09/2021), it wasn't working.

In Microsoft account , I can see Microsoft office home and student under Products you've purchased

When I try "Contact Support to transfer your license to this device"

Please elaborate on what you have tried so far. For example, have you tried repairing your installation?

How did you purchase Office in the first place?

Hi bansipatel did u issue got resolved, I am also facing the same issue.

As Dave asked, which product information do you see in your account?

Also, have you tried an Office repair (https://support.microsoft.com/en-us/office/repair-an-office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b)?

For more on activation issues, see https://support.microsoft.com/en-us/office/unlicensed-product-and-activation-errors-in-office-0d23d3c0-c19c-4b2f-9845-5344fedc4380.