If you can't send your CTS registration to the server, check the following:
Look for any animals with an ORANGE surround in the animal list:
This means 'Missing Data'. Press the (i) button to get the details:
The missing information will be highlighted in orange!
Fix the issue and try again. All animals with an orange surround will need to be fixed!
A YELLOW surround, means all data complete, awaiting upload to CTS!