Hi
I am so sorry to hear about your experience.
We have checked this scenario. The plugin works category wide… So simple products and variations that come under a category should get the discount.
May be there are other discount or plugins that produced a conflict? Usually when multiple discount plugins are present, it might lead to conflicts.
If you would like to give it a try again, would it be possible to send us screenshots of the rule configuration. You can leave us the message with the screenshots in our website at https://www.flycart.org
Really appreciate it.
Thanks
Ramesh