Homepod mini cannot be configured as stereoset
I just bought 2 homepods mini that I want to configure as stereoset for listening music. I use my iPhone 12 or iPad-Pro to configure them as explained in the manual. But the final configuration does never finish well (the spinning wheel keeps spining). Then sometimes the pods play both different music, but I haven’t any clue how it was selected. One time it was somehow the same song but out of sync instead of proper stereo.
After the first connection it seemed that they needed a software update so I presume they have the latest software available like my iPhone and iPad-Pro (automatic updates always on).
In the home-app I see the stereo homepod icon but when I click it only one Pod is turned on and starts playing no matter what, the other I must tap by hand to activate.
Can anyone guess what I might be doin wrong?
HomePod mini, 15