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in my case it's solved
Indeed, they fixed it. But they didn't even care to come here and tell us it was fixed. Thanks for the support, Spotify! All good, people.
To fix it, you follow step 1 for Debian at https://www.spotify.com/nl/download/linux/, that is
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 931FF8E79F0876134EDDBDCCA87FF9DF48BF1C90