Spotify Connect stops working on Yamaha RX-V685 AV Receiver

I own a Yamaha AV receiver (RX-V685) and recently, spotify connect suddenly stopped working. The behavior was that all other devices in my network (Mac OS, Windows, iOS) still displayed the AV receiver in the spotify app. But when trying to connect to it, the app would simply say “Connecting to RX-V685 …” forever, without ever really connecting.

It seems to have happened first after upgrading the receiver’s firmware from 1.96 to 2.01, but I’m not sure if this was the exact time where the problem appeared.

What I tried

After reading endless problem reports mostly on spotify support forums, I tried the following solution ideas. A lot of ideas did not help me; I’m listing them here for reference. Please read to to the end to find out what helped me.

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