Yoto App isn't showing what's playing on my kids yotos

As title says. When I play anything on the yoto, the app just says "Nothing is playing".

This happens on both the yotos in our household even when playing content directly from the app to the yoto. I have tried restarting the devices and have also checked the app is up to date (and even reinstalled it).

Could anyone help as I have no idea why it is doing this.