Your Amp probably needs an update before it can be seen in the app. You may need to use another device to do the update.  Do you have a computer that you can download the app to: https://support.sonos.com/en-us/downloads.

You can also try restarting your phone or resetting the app and reconnecting to your system

EDIT: Other things you an try are:

1. Move the Amp closer to your router
2. Connect it temporarily to your router/network with a cable to finish the setup.

Thank you for your message. I tried to connect the amp using ethernet cable. The app connected with the amp quickly and everything worked fine even updating the amp. Until i disconnected the ethernet cable. I even managed to update the connection via Wifi to the point where the app said ‘’Your Wifi has been updated and is now trusted network’’. But after that it says Your system not found on ‘’network name’’. It’s really frustrating and confusing. Now when i try to connect using WiFi i am stuck again.

Is the spot where you want the Amp far away from your router/AP?

if it is not inconvenient to keep the Amp wired, I would leave it connected in that manner if it works for you. I have 4 of 9 speakers/devices hardwired to my network. I have had no connection issues, even through the new app release.

The distance from the router was the first thing that crossed my mind. I have tried the same procedure right next to the router. Still stuck there. I am out of ideas.

I’m curious as to what Sonos Support said, when you called in?

It’s the last resort. I will call tomorrow. I even tried to change router settings. No success.

I didn’t call them in the end. I installed the system in a different house and everything worked easily. I am convinced there was problem with router settings or router/amp compatibility.