Django models being saved without USERNAME_FIELD

I have created custom user model extending AbsractBaseUser class. I have specified email field as the USERNAME_FIELD. But when I create an instance of this model and save it to the database, Django is only asking for the field which has been defined as foreign key and not asking email field to input. Is this the expected behavior? Where am I going wrong? I’m using Django shell to creating and saving a model instance.
Below is the model defined:

class UserProfile(AbstractBaseUser):
    id = models.UUIDField(default=uuid.uuid4, unique=True, primary_key=True, 
    first_name = models.CharField("first name", max_length=150, blank=True)
    last_name = models.CharField("last name", max_length=150, blank=True)
    email = models.EmailField(_("email address"), unique=True,
                              error_messages={"unique": _("A user with that email address already 
    role = models.ForeignKey("Role", on_delete=models.CASCADE)

    objects = UserManager()

    USERNAME_FIELD = "email"   

Any help is much appreciated

How specifically are you doing this? Please show the commands being entered.

Type "help", "copyright", "credits" or "license" for more information.
>>> from users.models import UserProfile
>>> user=UserProfile()
>>> user.role_id="e70ee1b9-bc09-48e4-bfb0-b221730e1a20"

I’m using python shell command for starting the shell

And what do you get if you query this model?

And what do you get if you query this model?

QuerySet of UserProfile object

Do the objects that you have created get shown? (What is actually generated here?)

Command print(UserProfile.objects.all().order_by('-created_at')) gives the following result -
<QuerySet [<UserProfile: >, ....]