What should I do if there is still a problem after replacing the old activation code with a new one?

The activation code can only be replaced once. In this case, it cannot be replaced again. If the original activation code order can be canceled as a whole, you can apply for a free replacement through the after-sales order; if some of the original activation code orders have been used and cannot be canceled as a whole, you need to apply for an after-sales order to purchase a new activation code at a cost.