Hello @Ralph Krausse can you please share more info on how you set this up? did you enable delivery reports for your SMS messages? This will help you track whether the message was successfully delivered or if there was an issue. You can enable this in your SMS client configuration.
Also, consider using the Azure Communication Services SDK to check the status of your sent messages. The status can provide insights into whether the message was delivered, failed, or is still pending. You can retrieve the message ID from the response object and use it to check the delivery status.
Best,
Grace