The network is poor. A poor network will cause the hb charity package to be unable to add a credit card. You only need to check the WiFi used and whether the link status is normal. HumbleBundle, or HB for short, is a website that mainly sells digital content such as games, e-books, and software. From time to time, some discounts will be launched, and several games will be bundled and sold in the form of charity packages.