[Answered ]-How to connect 2 many to many fields in Django

You would not want to have these kinds of references with ManyToMany. Ideally you would have a one sided reference.

You can do an inline in your admin like this:

class CustomUserInLine(admin.StackedInline):
    model = "CustomUser.user_counter.through"

Here are the docs for inline M2M in the admin: Django docs