Try deleting and re-installing the Sonos app and rebooting your phone.

And if that doesn’t work, maybe  tell us what kind of network and router you have, which might be helpful in diagnosing this issue. 

Hi.. I have a plusnet router (affiliated to BT)

I rebooted phone, re installed app.

I have a tablet and a I phone, both connectwith no problems. 

Throw us a bone and tell us what phone / tablet.

Sorry, pixel 6 phone

Huawei tablet

Anyway....I rebooted the router and solved the problem

Thanks anyway for replying 

For the future, this fixes almost every Sonos issue we come across.

https://www.youtube.com/watch?v=dKC93O1YRLQ

Good to know, but this does not portend well for the future. If you find Sonos devices “disappearing” from the app, and I think you will, please create a new thread and include the type of router you are using which will be significant.