Hi @JenniferFavorss !
In addition to the information Kylie provided, which I strongly encourage you to follow, are you by chance trying to add your child from the mobile app, or from the desktop? I wonder if there's a device-specific issue happening?
I also recommend checking out this guide here, just to ensure you're doing the right steps! You'd need to do this from your child's account. How do I generate a pairing code for an observer as a student?
If for some reason this still isn't working, your school's Canvas admin is also able to generate codes and link you to your child, just as Kylie mentioned. I'd recommend reaching out to them directly for assistance.
Best of luck to you!
Noah