unity.call doesn't fire

Hello, i create webview with this init:

`
newWebViewObject.Init(cb: (msg) => backfromJS(msg), transparent: false, ua: "", err: null, ld: (msg) => fullLoaded(msg), enableWKWebView: true);

void backfromJS(string msg) {
    Debug.Log(msg);
}`

i'm trying to send a message from my html to unity with this code:

<a id='a1-1-0' onclick="Unity.call('ca=1&sz=1&st=0');" class='list-group-item sub'>Test</a>

but the callback backfromJS never fires.

someone can help me.

i've see in a previous post that it can be used:
window.webkit.messageHandlers.unityControl.postMessage()

on a WKwebview, that i use, but i don't understand how.

thanks so much

Start with the Unity WebView initialization using enableWKWebView and trace how Unity.call from the supplied HTML is bridged to cb; compare it with the mentioned window.webkit.messageHandlers.unityControl.postMessage path. Reproduce the missing backfromJS callback and verify completion when the message is logged by Debug.Log.