The current issues with the ICCID are as follows:
-You can unlock any iPhone to use with these services only at the moment
-Apple servers are not allowing any T-Mobile Network Sim cards to be used with the unlock chip at the moment!
-Engineers are still working hard to find the ICCID to unlock for all carriers soon. It's a world crisis due to new iOS 13 release preparation. Your patience is much appreciated and we thank you for understanding the situation. The same situation happened around same time last year and we received the stable ICCIDs in a few days.