Adding Wireguard Client Address over MT APP

In my attempt to add windows wireguard PC client to my router, remotely, I am accessing the router over an IOS wireugard connection using the MT APP.
However, what is not working is adding the address of the peer ( the windowsPC ) on the router Wireguard settings. Never a problem via winbox but over the mt app, save doesnt save the entry for the address I make. I have the sneaking feeling that the APP is broken???