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I’m quite experienced with our Sonos system and have tried everything I can think of. The error message I get is that I have to update my system and re authorise the apps eg BBC Sounds ie to S2. We have a considerable investment in S1 Connect:Amps etc and am in no hurry to junk them.
There have been a couple of threads here recently where other S1 users had similar issue. Good luck trying to find them though as the search on this forum mostly useless. I can’t remember the solution, other than the standard contact Sonos Support.