I have had problems connecting to my Synology NAS. Having tried looking for an answer on the web and getting nowhere I phoned Sonos and after an hour I was no further forward. I eventually found a workaround , not a solution. I found if I unplugged my two One SLs and connected to the NAS Library using the Play 1 which worked correctly. If you try the play music from the One SLs you end up loosing the music again and have the access denied message. However, if you play the music from the Play 1 and link either or both One Sls to the Play 1 you can play the music. The One SLs can only play whatever is playing on the Play 1. At least I can play my music. Hopefully this might get sorted some time, but not holding my breath.
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