pulse_output failed to play: suspended

I have mpd running as a system service and as user mpd. Since mpd is a system service and pulse audio is session-based, I have to stream music from mpd to the currently active pulse session daemon. This is done using the module-native-protocol-tcp module configured with auth-anonymous=1 auth-cookie-enabled=0 listen=0.0.0.0 (loose, I know, but for testing purposes) The output in mpd.conf looks like this: audio_output { type "pulse" name "My (loopback) Pulse Output" server "localhost" } Now when I run a song in mpd it complains: pulse_output: "My (loopback) Pulse Output" [pulse] failed to play: suspended output: Failed to open audio output What is wrong here? Is this a bug? What I tried : Running as my user (systemd) Running as my user (systemd) and set the user in mpd.conf Running as root and set the user in mpd.conf Setting the exact sink name