We appreciate you taking the time to report this error to us. However, there are still some details that we need to collect from you before we are able to investigate this properly. If you could please provide the following information, we will make sure that your report is looked into so we can try to resolve it.
It would be incredibly helpful if you could include some screenshots of the issue occurring while your "Battle" chat log is open, so that we can more easily see that the ability is being used and the combo is not appearing. Thank you!