Best answer by Kamlesh_1
I also performed a Network reset, but that didn't work either.
Then I figured it was an issue with SMB share, so I checked Windows Features to see if the SMB file sharing support was installed. I noticed the SMB client feature was only installed, but not the SMB server feature. I checked off both options, did a restart, and then the Sonos Controller was able to connect to my network share.
If you're still having an issue connecting to your Windows 10 network share, then give that a try.