Cannot cast to chromecast audio group

[Juulie21]

Hi,

Im having a problem where i can only cast to seperate chromecast enabled devices (one chromecast audio, and a sony soundbar that has chromecast audio enabled), but not to a group. I added both of them to a group, and can succesfully use it with TuneIn Radio, and spotify trough the web browser. But the group is not showing up in the IOS app. Only the single devices.

I have the latest firmware on all devices. Latest spotify version, tried reinstalling, didn't work....