[SOLVED] no spotify connect through Headphone Jack (RPi3B)

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Hello all,

I searched through Google, Bing, Copilot, this forums, reddit, etc, but couldn't find a solution to my issue.

I installed moodeaudio on my Raspberry Pi 3B (v1.2) and coupled it to my stereo amp through the headphone jack.
It connected to my network in a matter of seconds and everything "this side" works just fine.
Webradio works just fine.
But when I try to use Spotify Connect the screen changes, Spotify (on Android, Windows and Linux) says, its using the moodeplayer, but there is no audio output. Nothing. When I select "this device" in Spotify app screen goes back to home screen, and everythings works as before.
How can I fix Spotify connect?

Following settings were done:

Audio Output

• Output device: "PI Headphone Jack"
  
• Volume type: "fixed (0dB)" (also tried Hardware and Software, but to no avail)
  

ALSA

• Max Volume "99"
  
• Output mode "Default"
  
• Loopback: Off
  
• Multiroom: no config
  

Renderers\Spotify Connect

• Service: ON
  
• Name: whatever
  
• Resume MPD: OFF
  
• settings: Bitrate: 320, but also tried default.
  

Audio Playback Information:

Code:

Input / Output
Source Spotify stream
Source format PCM
Decoded to PCM 16 bit 44.1 kHz, Stereo
Output format PCM 16 bit 44.1 kHz, Stereo, 1.411 Mbps
ALSA mode Default (plughw)
Audio chain Spotify -> plughw -> Device
DSP operations
Resample rate
Selective
CamillaDSP Off
Volume type Fixed (0dB output)
Audio Device
Device Pi Headphone jack
Mixer name PCM
Chip Broadcom SoC
Interface SOC
Formats U8, S16_LE
Platform Pi-3B 1.2 1GB

Can anybody help?

I tried several settings in the "Audio"-settings (like Software/Hardware-volume, ALSA output "Direct"), also in the Spotify Connect-settings.
I found this article: https://www.headphonesty.com/2021/09/int...ode-audio/
But the mentioned command didn't change anything.

Edit: it seems Bluetooth doesn't work either, nor through my Pixel 7, neither iPhone 14.

How can I use Spotify Connect with my RPi3B over the Headphone Jack?

Thanks in advance.