Your HP laptop's WiFi card, RTL8723DE, supports 802.11b/g/n standards, which means it's compatible with 2.4GHz networks but not 5GHz. The 5GHz band is typically associated with 802.11ac or ax standards. If you're experiencing connection issues on 2.4GHz, try forgetting the network in your WiFi settings and reconnecting, ensuring the password is correct. Also, check if your router firmware is up to date and if there are any driver updates for your WiFi card. For 5GHz connectivity, you would need to upgrade to a compatible WiFi adapter.