How to enable Co Author Plus for custom posts

Hello,

I’m using co author plus with a website using the Webnus Michigan Theme.

Half of it works fine, like on normal posts:

https://i.gyazo.com/2a23a594887fa0560fe4fe8c7cf35302.png

But it doesn’t work on the custom pages as you can see here:

https://i.gyazo.com/073818468d0a7084f6d0591fe427e0f9.png

Visually it works if I edit the posts on the inside, but the thing is that theme only shows Instructors that have courses and it only detects the first instructor, making the others to not show. THat’s why I’d like for it to work like the first image.

Thanks for your help in advance.