Our office recently upgraded our wi-fi access points. (Same password etc mind, other devices worked seamlessly)  As we couldn't get the Sonos speakers to connect, I have tried factory resetting and starting from scratch. After going through the setup process on the app (successfully!) The app says that the speaker has been added but may not appear in the system tab until after a reboot. After multiple reboots it still does not appear in the app and another factory reset and set up has not made a difference.

At the moment, I am working with one single Sonos Play:1 for troubleshooting, but there is a whole building full of speakers that are essentially unusable. Any ideas?