There are a few steps you as developer can take to ascertain why your apps is not working. Please have a look at the steps below and if your app is still not working, please contact us.

Step 1: 

Check if any of the APIs are experiencing downtime by clicking the following link: API Status
Click on the individual APIs will give a more detailed view: Uptime, Response Time and Response Time Per Country.
Troubleshoot: Our team gets alerted of API downtime, and this should be fixed within a few minutes.

Step 2: 

Check if the URL to your app can resolve correctly in your web browser. Also if you can navigate within the app.
Troubleshoot: If the URL does not resolve correctly in your browser, the problem is with the ISP, and you should notify them.

Step 3: 

If you have recently made changes to your app, please check that you are using only supported code.
Troubleshoot: Refer to Mobi Portal App Specifications

Step 4: 

If the app is still not working, log a ticket with us at Developer Support Centre (Apps and Apis or if its after 4pm Afterhours Support) informing us what you have tried as well as supplying the following information:

• App Name,
• Whether it is Mobi or C#,
• As much information of what the problem you are experiencing, and
• When it first started.