What seems a straight forward procedure is not achievable now. How do I correct this?
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Welcome to the Sonos Community! And, apologies for the delay.
Error 913 typically means that Sonos has refused the connection due to finding it to be SMBv1, rather than a later version (Sonos S2 only supports SMBv2/3). It may also be a mis-reported folder permissions issue.
I recommend a read of the following helpful thread on how to fix it:
There is no doubt in my mind that the Sonos apps are the very worst apps I have EVER used, and especially the worst of any for which I paid via buying Sonos speakers.