What kind of Sonos speaker? Rather than the inductive charging, have you wired the power directly into the USB C port? What device are you using to provide it power, what voltage and amps does it put out? Have you tried to call Sonos Support directly to discuss it?

This is the speaker.  When I hook up the USB I get nothing.  On the ring I just get a flashing red light

Then I would either wait a couple of hours, and see if that red flashing light goes away (allow the battery to charge some), or call Sonos Support directly to discuss it.

I note that you haven’t indicated what charger you’ve got connected. Is it the Sonos wall plug, or are you using something else?