Can you post a copy of your global.conf.json file? Those console messages seem a bit odd for US, I think.
Edit:. Actually, it would be the node choosing those spreading factors. I haven’t tried OTAA yet. The backend doesn’t seem to be sending any response, so I’m guessing that the message is just saying that it didn’t get any response. Are those console messages from the gateway page, or the application or debit page?