Sonos, no string items

Add-ons Bindings
1

I can’t get any of the string items (current title, current album, current artist) to display. I just get a “-”. Control and volume works fine. Here is my setup, does anything look out of place?

Items:

Group KitchenSonos

/* Kitchen Sonos */
Player KitchenSonosPlayPause "Play/Pause" (KitchenSonos) {channel="sonos:PLAY1:Kitchen:control"}
Dimmer KitchenSonosVolume {channel="sonos:PLAY1:Kitchen:volume"}
String KitchenSonosCurrentTrack "Current Track [%S]" {channel="sonos:PLAY1:Kitchen:currenttitle"}
String KitchenSonosCurrentAlbum "Current Album [%S]" {channel="sonos:PLAY1:Kitchen:currentalbum"}
String KitchenSonosCurrentArtist "Current Artist [%S]" {channel="sonos:PLAY1:Kitchen:currentartist"}

Sitemap:

Frame label="Sonos" {
    				Group item=KitchenSonos label="Sonos"
    				Slider item=KitchenSonosVolume  label="Sonos - Volume [%.1f %%]"
    				Text item=KitchenSonosCurrentTrack label="Current Track [%S]"
    				Text item=KitchenSonosCurrentAlbum label="Current Album [%S]"
    				Text item=KitchenSonosCurrentArtist label="Current Artist [%S]"
    			}
2

what about using [%s], it has to be lowercase

3

Unfortunately, it didn’t work.

Using [%s] I get “NOT_IMPLEMENTED” for current track and nothing for current artist or current album (just blank, not even a “-”.)