Cannot add user to organization

trying to add a new user to my organization through Unity ID
but receiving user not found error

I would expect they first have to create a Unity account and/or be added to the organization’s Team in the Unity Account dashboard.

Then you need to check your URLs because you are in the Asset Store publisher portal. This is NOT the Unity Cloud dashboard (since you tagged this thread with Unity Services and Cloud-Code).

Lastly, don’t post someone else’s email addresses in public.