Sonos only available on network 1

Hi! This may be a newbie question, but I've tried different options in advanced mode and also read some of the threads in the forum about problems with Sonos connected to Orbi, but I can't find a solution.

I have a Sonos bridge connected to one of my Satelites with cable, as I have with other bridges like Hue and other smarthome parts. Sonos speakers (6 pcs) then connects to the Bridge over the Sonos network.

As long as I'm connected to Network 1 (the most secure, as Netgear states in the admin interface) over Wifi I can reach Sonos, and everything works well. But when I switch to Network 2 (as all other users will), I can't connect to Sonos.

When on Network 1, everything works well.

Trying to figure out how to "allow access" from Network 2 as well.

Any ideas? I feels like i'm missing ticking a checkbox somewhere.

BTW, in Network 2 I have checked the: "Allow employees to see each other and access my local network" but that doesn't help.

Hardware Version SRR60 and SRS60
Firmware Version V2.5.3.110
Operation Mode Router