Add new iOS device after certs were generated
The devices that are allowed to install a debug/adhoc iOS app are stored within the provisioning profile files that are created when we handle your iOS certificates and are stored on our build server. Therefore, in order to allow a new device to download your iOS app after we've already done your certificates there's going to be a few extra steps.
1. Add the new device on your account at developer.apple.com/account
2. Under the Profiles menu in Apple Developer, edit your existing development & adhoc provisioning profiles and check the box to include the new device (Note: if you don't need to debug your app you can skip the development profile and just do the ad-hoc one)
3. After saving the changes, download the profile and email it to us and we will add it to the build server
After we've added it, you can do a new iOS debug build and test with the new device.