It seems like it's time to try to collect at much info as possible on not being able to add Ikea symphonisk’s since the last update.
In my case, I bought some Symphonisk picture frames. Via ethernet and or wifi, you can get to the very last step, verify audio pin and then you are told that there was an issue adding the product to your system no matter what route you take, manual pin verification, audio pin verification, same outcome.
For science I returned the first set and got another set. Same exact issue.
For science one more time, I returned those and tried it again, same exact issue.
I was able to successfully add a sub mini which is great, but pointless at this point.
This was attempted with both an ios and and an android device on the latest release for both platforms.
Attempting to use the 16.1 app on android to try to add these speakers does not work either. Not because it doesn’t work but because the app refuses to let you add anything IF you are not running the latest app. Try to add a new device and it will tell you you're not on the latest app, block the internet connection and try to add and you still can't add anything because the app can't check to make sure it's the latest version.