On your secondary device, open the WhatsApp application and proceed to the section where you enter your phone number. Tap on the three dots in the top right corner to open the menu. In the menu, select the option labeled ‘Link device.’ On your primary device, open the WhatsApp app and go to the ‘Settings’ menu. Navigate to the ‘Linked Devices’ section. Tap on ‘Link a Device.’
Use your primary device to scan the QR code displayed on your secondary device. Wait for the devices to sync. Once complete, your WhatsApp account should now be able to function on both devices simultaneously.