My Sonos Beam will not connect with my network anymore. I changed the password so when it says “Did you change the password” I say yes.
Do you want to add a network? Yes.
Find system...Sonos not found.
I rebooted the system and the router.
What do I do next?
Wire your Beam to your router with a temporary Ethernet cable. Start up the Sonos controller. Does it find the Beam?
If so, go in to settings, and change your network data. Probably easiest to delete what is there now, then go in and re-enter the new data. Once you’ve done that, you should be able to remove the temporary Ethernet cable, and it should stay connected, assuming the ‘radio / WiFi’ hasn’t been turned off on the Beam.
Cable the Beam, or another of your Sonos devices, from the same setup, to your router and reboot the Beam. Let things settle post reboot, then scan and change its password/credentials using the same ‘update networks’ method you mentioned in your post. See if that resolves the issue.
(edit: Bruce beat me to it. 
)
This worked. Thanks.
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