@Ernst-Jan15 Same problem here with my new Signal UT app, seems to be a limitation with Xmir applications, as the icon never makes it to the left panel.

@ToxyPoxy Although it seems that calls could possibly make its way to Whatsapp web one day, which would be amazing, and then we will probably be able to support it inside the app. https://beebom.com/whatsapp-web-voice-and-video-calling-coming-soon/ https://3dvf.com/en/whatsapp-will-soon-allow-making-calls-directly-from-your-web-browser/

Most accounts nowadays force users to use app passwords when using 3rd party apps. Most likely this is what you need.