Hello.
I rechecked the provided Log data and as I see Create Subsctiotion call doesn't have PlanID (MISSING_REQUIRED_PARAMETER) which should be gotten on a previous step. It looks like PayPal cannot automatically create Product and\or Plan for some reason. If you use a 'test' mode and provide me with Studio and FTP access to your server I could be able to investigate the issue directly on your server. I need to get more detailed answers from PayPal when Create Product and Create Plan call are performed. You may contact me via PM.