After regular setup process device is not visible at Sonos App. It is not visible also after restart of device. Setup process was repeated after factory reset at two Android phones at two different wifi networks at 2.4GHz and also at 5 GHz but without success. After reset of App. Software (firmware) update was started but it couldn't completed.
Setup issues with Sonos Roam SL
You’re probably best to discuss the matter with Sonos customer services rather than post here in the user community. Here is the link to do that…
https://support.sonos.com/s/contact
Also ensure your local WiFi is 802.11b/g/n compatible with security mode WPA2 (personal) and that there are no unsupported network features, or devices, as mentioned in the Sonos System Requirements:
https://support.sonos.com/en-us/article/sonos-system-requirements
Software update was possible to do only through the application for Windows, not through the android application. It was not up to WiFi setup.
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