Spotify Connect doesn't work with a managed account on the wobie box

The issue is a managed Spotify account. Managed accounts don't support Spotify Connect, so they can't connect to the wobie box through wobie fav.

In wobie fav, you choose what content is assigned to wobie box buttons. To use Spotify Connect, choose a regular Spotify account rather than a managed one.

You can also restrict explicit content on a regular account. Spotify lets you turn off explicit content. Look here:
Settings and privacy → Content and display → turn off ‘Allow explicit content’

💡 Spotify streaming & Family plans:
One Spotify account can play music on one device at a time. A Family plan includes separate member accounts with their own login details.

This differs from services such as Netflix or Prime Video, where one account can be used on several devices at once.

You can switch between Spotify accounts in the app. See:
https://support.spotify.com/de/article/how-to-log-out/

With separate accounts, a wobie box and phone — or two wobie boxes — can stream simultaneously without interrupting each other.