Status code: 400 error: Created Report object is invalid after game crashed

If you can find the actual .dmp file there is a tool for handling that: https://dev.revolutionarygamesstudio.com/crashdump-tool
It doesn’t store the output so if that works with the dump file you should put the result you get on pastebin.com. If that also gives some kind of error, then something is off with the dmp file you got.