Sitemap with Grafana with items for the window not working

I want to show some Grafana graphics and use items (a string) for the selection window but can’t get it to work. The first line is working. The String items have the same values

Webview icon=line url="http://192.168.100.92:3000/d-solo/acd79318-1386-468b-a8c0-76ab83d0d03b/test?orgId=1&=1&panelId=1&from=1693519201000&to=1698850681000&refresh=1m" height=8  visibility=[OmvormersGrafanaWindow=="3"]

the below is not working. What is wrong?

Webview icon=line url="http://192.168.100.92:3000/d-solo/acd79318-1386-468b-a8c0-76ab83d0d03b/test?orgId=1&=1&panelId=1&from=StartDezeMaand.state&to=Nu.state&refresh=1m" height=8  visibility=[OmvormersGrafanaWindow=="3"]```