After The upgrade….

impossible to reconnect Sonos Era 100 and a Sonos Move. 
Background: my WiFi network also migrated and is now using WiFi 6 standard. 
Both products just don’t want to connect to the network. The systematically go for an extender (even when I tell them NOT to connect through an extender). A bit frustrating when you arrive in a loop in the app…. Resetting to factory settings not helping either…

So Sonos, what should I do?