Hi @nietof,
If I am not mistaken, it appears as if you are entering commands into the Windows Command Prompt, and not the Windows Subsystem for Linux.
You'll have to install WSL onto your system following the details in the link provided. I am currently using the Ubuntu 18.04 LTS in my WSL.
Here is a screenshot of my Windows 10 Taskbar with the Windows Command Prompt (left) and the Ubuntu 18.04 LTS WSL (right).
Basically, I'll open my Ubuntu WSL and then activate QIIME 2 as I would on any Linux system. From here you can proceed as you would on your Mac or Linux machine.
I hope this helps! I am sure others will have other insights on this too!
-Best!
-Mike