Using Wireguard and mwan3

I installed and configured mwan3 yesterday successfully. However, wireguard no longer worked though it had worked before.
I've tried to reconfigured rules, policy ofmwan3 and port forward in firewall but my phone still refused to connect.

Please help!

You must use Wireguard thru the currently up Internet connection.

The point is i dont know how to set it :). both wans are up since I use balance policy.