Thanks for reaching out to us eamonnjconnolly.
It is odd to hear that some devices are playing video back correctly while other devices/platforms are not. It looks like there is an issue with your account regarding available licenses. You have purchased 1 camera license, yet you have two folders created. This could certainly cause issues with upload or playback, so please be sure to either delete one camera folder or order a second subscription to support both cameras.
To confirm the core issue you are reporting, you say that only the iOS viewer application is having a problem? Have you already tried restarting the device or re-installing the viewer app? Please email our support team directly so we can help you troubleshoot more comprehensively: email@example.com