I can't watch ad to complete daily mission

I can't watch ad to complete daily mission. Ehen i click watch bottom game is restarting i have try each and every solution from community which help to solve issues and error like

1. Clear Cache
2. Uninstall and install game
3. From both Wi-Fi and cellular data
4. Restart mobile
5. Try 5 different wi-fi 

If your team can't solve this problem your whole management should resign from their job.