All Sonos speakers must be on the same network and account. Meaning that individual users can’t have a personal account for a speaker and try to Group to speakers on a different account.

Hey AjTrek1, 

All speakers are connected to 1 account  and 1 wifi network and only 1 person has access to the account.

Is the WiFi network a Mesh system or a router and modem with access points?

It’s a router and modem with access points.

Network model numbers?

Here are things you might check/verify/correct (if necessasry):

Make sure you’re connected to the right WiFi network

Go to the WiFi settings on your computer, phone, or tablet, and confirm it is connected to the same WiFi network as Sonos. Check that your device isn’t connected to a guest network as this can prevent your device from connecting to Sonos.

Turn off your VPN connection

If you use a VPN connection on your mobile device or computer, turn it off and check if your Sonos app reconnects to your system.

Wired setup requirements

• One or more Sonos products wired to the router via Ethernet cable at all times 1
• Support for Spanning Tree Protocol (STP)

Unsupported network setups and devices

• Wireless internet connections such as satellite, mobile hotspots, or LTE routers
• Guest networks or networks that use a portal login page
• Networks using wireless range extenders 2
• Ethernet over Power (EOP) devices
• WPA/WPA2 Enterprise
• VPNs blocking access to local network resources

1 In WiFi mesh networks, Sonos products must be wired to the primary mesh node if using a wired setup.

2 If you need to extend your home WiFi to use Sonos in a wireless setup, we recommend using a WiFi mesh router to do so.