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Internet is not working when VPN is connected in Android because of the way Android is designed. Android is based on Linux, which is a Unix-based operating system. VPNs work by creating a secure connection between your computer and the VPN server. Android is not designed to create a secure connection, so when you connect to a VPN while using Android, the device is not able to keep track of the security and encryption keys needed to keep your data safe.

This means that any data that is sent over the VPN connection is not protected and can be easily intercepted by anyone who is able to monitor the traffic. This is why internet is not working when VPN is connected in Android.