We've encountered an issue related to two-factor authentication cookie validation after a major Django version upgrade, as detailed in issue [#686](https://github.com/jazzband/django-two-factor-auth/issues/686). This issue arises due to the change in user password hashes when Django's hash iteration count is updated in a new version, leading to a mismatch in the two-factor authentication cookies' validation.

We can for now implement a workaround. This involves catching the `BadSignature` exception raised during the cookie validation process when there's a mismatch in the hashes. This situation occurs after upgrading Django, which causes the user's password hash to change, thereby invalidating the existing two-factor authentication cookies.

This issue is critical for us to upgrade our Django version without disrupting the user experience of people coming back and having a 2FA cookie.

posthog/api/authentication.py
token = self.request.query_params.get("token")
        user_uuid = self.kwargs.get("user_uuid")
        if not token:
            raise serializers.ValidationError({"token": ["This field is required."]}, code="required")
        
        if settings.E2E_TESTING and user_uuid == "e2e_test_user" and token == "e2e_test_token":
            return {"success": True, "token": token}
        try:
            user = User.objects.filter(is_active=True).get(uuid=user_uuid)
        except User.DoesNotExist:
            user = None
        if not user or not password_reset_token_generator.check_token(user, token):
            raise serializers.ValidationError(
                {"token": ["This reset token is invalid or has expired."]},
                code="invalid_token",
            )
        return {"success": True, "token": token}
    def retrieve(self, request: Request, *args: Any, **kwargs: Any) -> Response:
        response = super().retrieve(request, *args, **kwargs)
        response.status_code = self.SUCCESS_STATUS_CODE
        return response
class PasswordResetTokenGenerator(DefaultPasswordResetTokenGenerator):
    def _make_hash_value(self, user, timestamp):
        
        
        usable_user: User = User.objects.get(pk=user.pk)
        return f"{user.pk}{user.email}{usable_user.requested_password_reset_at}{timestamp}"
password_reset_token_generator = PasswordResetTokenGenerator()