Further information: while waiting for MYOB support to sort this out, I have knocked up a small test program which does not use the .NET SDK provided by MYOB, but just issues direct HTTP calls to the server (which is what the SDK objects do inside the black boxes). I can obtain the list of available company files, but as soon as I try to retrieve ANY data from the 2019.2 file, it fails, and the message I have seen says "The company file version is not supported". I CAN retrieve data from an earlier version company file. So it seems to me that something significant has changed at the server end, and the documentation and/or the SDK has not been updated to reflect it. Either that, or the change was unintentional and needs to be fixed. It is now a week since I reported this to MYOB, and still my strong impression is that nobody knows what is going on. Very unimpressed.
What endpoint are you trying to access?
When using the raw http request, what is the URL you are making the "get" call against?
