I have created a project in .NET 8 that I wish to migrate to .NET 4.6.1 for it to be compatible with some other programs I have. The question I have is how this works beyond changing the csproj file. What has to be done to files like Program.cs and Startup.cs?

We have deployed our service on the server (IIS server), but the PUT API is not working when we try to hit it. Rest all the APIs works. We have added code to the web.config file, but we are still facing the same issue. here is the code;