I thought it might be the port issue so I tried to switch LMS's port around...9000,9001,9002...tried quite a few. Couldn't see still. Anyone know what port Squeezelite on Volumio uses? And is it possible to manipulate the port?
I ran into this same issue, exactly as you describe it.
For me, I was using a RasPi 3b+ with latest volumio installed directly on the disk. My desired output was through the 1/8" audio jack, using the native squeezelite plugin.
After brute forcing the settings, I was finally able to get it working by changing the following:
Settings>Plugins>Installed Plugins>Squeezelite Player>Settings>Configure Audio Output Settings>Output Device: Changed the option to:
This setting works with Volumio + squeezelite plugin, on the Raspberry Pi 3b+, outputting to the 1/8" jack.
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[(default) bcm2835 ALSA] Default Audio Device ^ Note: this is the second option from the top on my RasPi.
Once I saved, and possibly restarted the Pi, it showed up in my LMS docker container. For reference, these are the ports I am using. Since I also played with changing the ports, I am not positive these are the defaults. But they certainly work for me: 3483 9000 9090
I have searched everywhere for this, even posting in the Gitter chat, without success. So if this helps you or someone else out, outstanding. It was worth registering for.