Resolved winsdkfb can't be load in unity

Hello, I want to implement facebook login in Unity for UWP. All I know is I need winsdkfb to do it. So I need help about how to add winsdkfb to unity.
I've read some of old thread about integrated winsdkfb to unity. But none of them resolve my problem.

What I've done:

• I download the dll from here https://www.nuget.org/packages/winsdkfb/
• I add the winsdkfb.dll to Assets\Plugins ( in the Inspector pane I Deselect “Any Platform” and select Editor instead)
• I add the winsdkfb.winmd to Assets\Plugins\WSA ( in the inspector pane I choose WSAPlayer and placeholer to winsdkfb.dll)
• Create C# script
• add "using winsdkfb"

But the IDE (VS 2017) can't read/found the winsdkfb


I use:
Unity 2020.3.6f1
Visual Studio Community 2017
winsdkfb 0.15.0

Here is my ss all my configuration in Unity





Please help me.
Or do you guys have better solution without winsdkfb ?

thank you very much for your attention.

 

Thank you for your advice
I try to use the define but code inside ENABLE_WINMD_SUPPORT is grey out. I try to add Debug.Log inside it and the log not appear.
Changing scripting backend to Any also doesn't resolve the issue

I think winsdkfb from nuget.org doesn't run same runtime with unity runtime

 

I try build UWP and get this error message

winsdkfb.dll' could not be opened -- PE image doesn't contain managed metadata

EDIT:
I can remove this error by remove placeholer, IDK if this is the correct way.

 

thank you for your confirmation