I’m not positive if reading and restoring is mandatory; this is simply different from the tutorial and may make a difference. I would look at this last in the troubleshooting process.
Regarding the 2 lines in the iOS log: Make sure that Online Subsystem iOS is enabled in the plugins. This should take care of those two lines.
Regarding iTunes Connect, please see the solutions posted on the following Answer Hub posts:
In app purchase is failing for iOS
And make sure to check out the Apple link provided: