If you are using a mobile device management (MDM) system to manage a large number of iDevices, you have have restrictions in place that block certain app functionality. Please make sure the following websites are safelisted:
All apps:
*.ishareprc.com
*.realizelanguage.com
*.ishareservices.com
*.touchchatapp.com
*.prentrom.com
*.dropbox.com
*.itunes.apple.com
*.youtube.com
*.googlevideo.com
*.prc-saltillo.com
*.thevoicekeeper.com
*.s3.amzonaws.com
*.lampwflapp.com
*.unityaacapp.com
*.dialogueaacapp.com
In addition, we recommend opening both port 80 (http) and port 433 (https).