Upgrade Windows 11 Enterprise Evaluation to Normal Windows 11 Enterprise

Hello,

I am not very good at IT and run a small business. 

I wanted to install Windows 11 Enterprise on 3 work laptops so I googled Windows 11 Enterprise Download, and installed this:

https://www.microsoft.com/en-us/evalcenter/download-windows-11-enterprise

It now seems like this 'Evaluation' mode of Windows is not a normal version and will expire after 90 days. Can anyone tell me how to upgrade to the normal version of Windows 11 Enterprise?

We use Microsoft M365 E3 which includes Windows 11 Enterprise, although I do not have product keys (or I don't know how to get them).

Can anyone help me, please?

Thanks,

Nigel