@StevenJP I moved your post here for visibility in our community ideas board as this feature is currently not available. Regarding the issue you reported, I see you have a ticket opened with support, you should continue to work with them for a resolution.
We are planning on releasing the end-user portal in November, with the ability to create end-users from the admin portal. This will allow you to create new end-users and attach them to tickets.
We are also working on a feature to create new end-users and attach them to tickets directly from the ticket editor. This is currently planned for Q1 2023.