Hi RaizelX,
Thanks for reaching us in community.
For the Office Add-ins, we should first check if there any error information when it fails to work functioning.
The following table lists common error messages that users might encounter and steps that your users can take to resolve the errors.
| Error message |
Resolution |
| App error: Catalog could not be reached |
Verify firewall settings."Catalog" refers to AppSource. This message indicates that the user cannot access AppSource. |
| APP ERROR: This app could not be started. Close this dialog to ignore the problem or click "Restart" to try again. |
Verify that the latest Office updates are installed. |
| Error: Object doesn't support property or method 'defineProperty' |
Confirm that Internet Explorer is not running in Compatibility Mode. Go to Tools > Compatibility View Settings. |
| Sorry, we couldn't load the app because your browser version is not supported. Click here for a list of supported browser versions. |
Make sure that the browser supports HTML5 local storage, or reset your Internet Explorer settings. For information about supported browsers, see<br>Requirements for running Office Add-ins. |
If this add-in problem still cannot be resolved via the above methods, please kindly share us the error page your users had, so that we can make a better analysis on it.
Best,
Shawn