Spotify Connect no longer working on Audio Pro C10

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Plan: Duo

Free/Premium: Premium

Country: Sweden

Device:

- Audio Pro C10

- OnePlus 7 Pro (Android 11) Spotify: 8.6.30.889

- Samsung S20 FE (Android 11) Spotify: 8.6.30.889

- MacBook Pro (Catalina) Spotify: 1.1.60.672.g6ad9c215-a

My Question or Issue

Up until today Spotify Connect has been working flawlessly with my Audio Pro C10 but now I can't start a stream from any device (tried 2 Android phones and a Macbook). I only get an endless 'Connecting...' status and nothing else, no error or anything.

I did a 'Logout everywhere' for Spotify, restarted all devices, all routers and did a factory reset of the Audio Pro C10 speaker, but no luck. All Chromecasts and Google Home work as normal.

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Seem to have magically started working again...