Not sure
Is the ReceivingEnabled set to Off? If so, set it to one of the options as shown in the image.
Set to either Foreground or Always. Please read Component Documentation Social
The default setting for ReceivingEnabled was changed from I believe Foreground to Off to conform to Google guidelines. The NoTexting tutorial was written when the default was Foreground. If you have this set to Off, that is the probable issue.
Try setting to Foreground or Always and let us know what happens.