Hi @Gerald_Thomas,
Please feel free to share with the community what was the solution?
As for the new error in sending SMS …
This is the same error you faced before in User Extended App issue
There seems to be an issue with the instructions sent. Could you share more info about how you are sending the SMS such as configuration settings? Steps to reproduce?
As much detailed (non-sensitive) info as possible so that @zubair and other community members might be able to help. Thank you!