Hi Peter,
My name is Igor, I have 12 Microsoft MVP awards. It's a pleasure for me to help others and I'll do all my best to help you. I'm sorry you have a problems.
It is more effective to ask such questions at Q&A forum https://docs.microsoft.com/en-us/answers/index....
It is oriented to programmers, admins and corporate users, and this forum - to home users so local experts may have no corresponding knowledge, sorry.
And please consider error reopring at https://github.com/dotnet/roslyn/blob/main/docs...