I xamrain I made a short jinq video to explain what is going wrong. Basically, the reference is being destroyed on every rebuild in visual studio 2019.
Only in the shared code libary, i might add which is the one i need to be an able to reference the dll as that is where my shared code base is this is a standard xamrian project and should work within it.
https://www.screencast.com/t/tGLZwRnXa6