key

if you got key not found 
https://stackoverflow.com/questions/57012001/invalidoperationexception-key-type-not-specified-microsoft-aspnetcore-apiautho


For File

 "IdentityServer": {
    "Key": {
      "Type": "File",
      "FilePath": "C:\cert.pfx",
      "Password": "password123"
    }
  }
For Development (don't use in production obviously)

 "IdentityServer": {
    "Key": {
      "Type": "Development"
    }
  }
For Store

"IdentityServer": {
  "Key": {
    "Type": "Store",
    "StoreName": "My",
    "StoreLocation": "CurrentUser",
    "Name": "CN=MyApplication"
  }
}
link