I've already looked at this question here and here, however that method doesn't work as it causes crashes when testing inside of the editor. I'm working strictly in C++ for this portion of our game and I want to set the developer secret key via code when the server is starting up. The docs seem to be out of date and there's conflicting information on various posts i've looked at.
From looking through code, it seems the only place to set it is UPlayFabRuntimeSettings, however that's not mutable as far as I can tell.