Just purchased 2 Sonos Ports to replace my “Connects” and had no issue connecting the first to my house speakers, using the digital output. But the connection to my AV system was through the TV/CD input on my Integra Amp with an optical (Toslink) connector. There is no Toslink capability on the Port. Problem solved by using a digital coax to Toslink converter from Amazon for less than $15. Here’s a link. https://smile.amazon.com/gp/product/B0791CFGY1/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1
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+17
Thanks for sharing your workaround! I’ve used a similar device in the past on an old TV that didn’t have TOSLINK to hook up my Playbase. It worked well for the time that I needed it! 
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