Custom Church Apps needs your Apple Team ID in order to create and submit your app to the iTunes App Store.
You can find your Team ID as follows:
1. Open a web browser to https://developer.apple.com/account. Login with your Apple Dev account credentials.
2. When you reach the Overview page, click the "Membership" item on the left menu
3. On the Membership page, locate the "Team ID" field. Select the value and copy to your clipboard.
4. In the Custom Church Apps customer console, in the App Store section you can paste the value into the Team ID field as shown below: