Multiple authors

Thats not an option wordpress only shows one, only allows one by default so to add more you need to find a plugin ( I don’t know of any) or create your own.

Kadence Themes

Yes, there is one – “co authors”, but it doesn’t work with the theme. :/

Then you would need to code in the support for the plugin.

Kadence Themes

PS by not working have you contacted the plugin authors and asked for a easy way to integrate with a theme?

Kadence themes