You’re welcome.
Yes, the Soft-eLicenser is more of an involved process to re-activate than if you had a USB-eLicenser. With the USB-eLicenser the license is stored permanently on the dongle. You just re-install your software, plug it in, and you are ready to go.
I’m still not completely clear on your situation. Can your son get into his MySteinberg account? Does the previously registered Soft-eLicenser show up there? If so, just follow the steps for “Activation & Reactivation”.