Widevine DRM is not working

Hi!

I'm trying to activate widevine drm in the player as it says in the documentation (https://developer.roku.com/docs/specs/media/content-protection.md), but it still doesn't work. I have also added the lines to the manifest.

The code:

if streaming.licenseUrl <> invalid
        drmParams = {
            licenseServerURL: streaming.licenseUrl.widevine
            keySystem: "Widevine"
        }
        m.child[0].drmParams = drmParams
    end if
    if streaming.url <> invalid
        m.child[0].url = streaming.url

        node = CreateObject("roSGNode", "ContentNode")
        node.Update({children: m.child}, true)

        m.videoPlayer.content = node
        m.videoPlayer.enableUI = false
        m.videoPlayer.contentIsPlaylist = true

        m.videoPlayer.control = "play"
        m.videoPlayer.ObserveField("state", "OnVideoPlayerStateChange")
        m.videoPlayer.ObserveField("visible", "OnVideoVisibleChange")
    else
        errorPlayContent()
    end if

I am doing something wrong? Or am I missing something to add?