Sonos was unable to add the music folder The computer Shirleyanders1 cannot be found
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Computers and their firewalls can be a little picky sometimes.
The first thing I always try is installing the Sonos app on the computer that has the folder you want to share. Then using the app on that computer to add the folder. A lot of times that makes it much simpler and works.
If you are already trying to add from that computer or another device, post what kind of computer it is.