Boot camp win10 installation

Hi community

I am trying to install win10 via boot camp assistant og my mocbook pro with Big Sur

Everything goes fin until the beginning of the installation process

• 1 I start boot camp and running the installere it make my USB ready
• 2 Boot camp gets the windows files from Apple, downloads apple files for windows
• 3 I select the windows partiton and boot camp makes the partition ready and restart
• 4 I see the blue window and the test "installer program is running"
• 5 Windows asked for a key and I enter the key and hit enter
• 6. After a few seconds a window pops up "No installation media found"
• 7 The only optiian I then have is to quit :-(

Question:

What windows version is my macbook pro downloading from Apple? 7, 8. 10 or 11?

What am I doing wrong in the process?

My windows key is for win10 Home

When I later start my macbook pro, with the "option" key pressed, I get three options to choose 1. MacOS, 2. EFI boot, 3. Windows.

If I press windows it is looking for a installation media and wants med to insert and press the any key

If I press EFI boot, I end up in the same situation as when I am running Boot Camp, "enter key", "no media found"

I am a littlte frustrated now, and can't figur out what is wrong!

Any advice

Thanks in advance

Chrisiian