Hey! Can you tell me if it is the latest version of Windows 10 or LTSB/LTSC (or something like that)? The second version of Windows 10 I mentioned is an older one, without bloatware, including Microsoft Store. If you tried everything that John said, try this:
https://github.com/kkkgo/LTSC-Add-MicrosoftStore (For LTSC)
https://github.com/kkkgo/LTSB-Add-MicrosoftStore (For LTSB)!! Pay attention to the version !!
If you can do a screenshot of your Windows Version that would be awesome:
Do Win + R on your keyboard and type "winver". Screenshot that and send it to us!
If you want to try installing the Microsoft Store using the links I provided, scroll down for instructions or search on Google for a YouTube video.