if "email" in request.context.get("prompt_data", {}):
  # Fetch a user with the same email as the new user being enrolled
  existing_user = ak_user_by(email=request.context["prompt_data"]["email"])

  # If a user with the same email address exists, show a message and deny access
  if existing_user:
    ak_message("An account with this email address already exists. Please use a different email address.")
    return False

# If the email is unique or 'email' is not in prompt_data context, allow the access
return True