If your license was purchased through a reseller (Thomann, Amazon, etc.), please create a BorisFX Account when installing the hub. Please install and launch the software you have purchased via the BorisFX Hub. You can activate your license there immediately, but it will not show up in your Boris FX Account on borisfx.com
This has no practical disadvantage, but if you want to have it visible in your accounts "licenses" section, contact BorisFX Support and provide your serial number.