Can I activate Windows 7 Pro OEM with a Windows 10 Pro OEM key (downgrade)?

Question

Windows

Good afternoon
Available:

• Sticker on the PC case with an OEM key from Windows 10 Pro
  

• Installed, non-activated Windows 7 Pro OEM, downloaded from the link
  

The microsoft website states that downgrading from windows 10 Pro OEM to Windows 7 Pro OEM is possible ( link ), but changing the product code in Windows 7 to a 25-digit key from Windows 10 fails.
When entering in the standard window for changing the key, you cannot enter the symbol "N". There is a symbol on the sticker with the keys, but for windows 7 it is invalid for some reason .
If you try to install the key through slmgr.vbs /ipk, then an error appears
Is there any way to activate Windows 7 Pro OEM with a key from Windows 10 Pro OEM (downgrade)?

Answer 1

to downgrade, you need to call ms support, but OEM licenses do not have a downgrade option

Answer 2

OEM licenses provide for the possibility of downgrading, but!
1. Only Pro and Ultimate editions can be downgraded. At the moment, Windows 10 is downgraded to Win 7.
2. The second condition for the downgrade is that the distribution kit from which the system is installed must be obtained legally. For example, an OEM install disk from another PC you own.
3. The key from Win 10 cannot activate the system. As mentioned above, you will need to call MS, the activation service, and after confirmation you will be provided with a one-time activation code. In this case, MS does not provide a key.
All this is written in detail here.