Hi @Cocorascal
Welcome to the Sonos Community!
Sorry to hear of this issue you have been having with connecting your Era 100 speaker to your Sky WiFi.
Do you have any Sky TV boxes? If so, they will be rebroadcasting your Sky WiFi, but in a way not supported by Sonos. To work around this, please switch off your Sky TV box while setting up your Sonos speaker.
If this works for you, you may want to look into disabling the broadcast from your Sky TV box(es) - I recommend you get in touch with our technical support team who will look into your options.
If you don’t have Sky TV, please turn your router off for at least 30 seconds, and reboot your phone/tablet while waiting for WiFi to return.
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein