Hello,
on the page https://spotifyd.github.io/spotifyd/installation/Raspberry-Pi.html
I found out that configuration file ~/.config/spotifyd/spotifyd.conf example is corrupted.
Line with :

device = alsa_audio_device # Given by aplay -L

should have value in quotes

device = "alsa_audio_device" # Given by aplay -L

It invalidates TOML so spotifyd will throw error:
Error:
0: could not load the config file
1: invalid TOML value, did you mean to use a quoted string? at line 5 column 10

Location:
/rustc/f1edd0429582dd29cccacaf50fd134b05593bd9c/library/core/src/result.rs:1914

note:
the config format should be valid TOML
we recently changed the config format, see #765