I had a quick look over to your issue and was able to get the survey to my KoBoCollect android app (by sharing it to my KoBoToolbox user account). I kept the exact settings that you have made while sharing it i.e. used the permission as shown in the image below:
Reference that i was able to Get Blank Form to my device:
Please ensure you have the correct configuration settings under the Server Settings:
URL: https://kc.humanitarianresponse.info
Username: xxxxx
Password: xxxxx
Note: do not use the / key at the end of the URL. It this still does not work try resetting the sharing permissions. It should work by now.
Have a great day!