Currently when someone submit the form, they can submit it without checking the radio inputs. Although you had used required attribute to indicate the the input is required previously, this can’t work in this case, because adding required to both inputs, will convey the wrong information to the form users.
To solve this, you can provide context of what is needed by adding a legend element with text Account type (required) before the label elements within the second fieldset. Then add the checked attribute to the Personal input to ensure the form is submitted with the required data in it.
