Bundled plugins for any theme on Themeforest works the same way, Avada is no different. You do not need an additional license or ‘activation code’ in order to use the bundled plugins, with the theme. The ‘activation code’ is a generic message added to the plugin by the plugin developer and can be dismissed.
You can read this Envato help file explaining how bundled plugins work -> https://help.market.envato.com/hc/en-us/articles/213762463-Bundled-Plugins
And please note, your described issue not a bug. If you did need to contact us for something you can use this contact page -> https://theme-fusion.com/contact-us/ – or for general guidance, post here to the forum
Thank you kindly