I recommend this one: 

USB C Charger, Anker 60W Power Delivery Fast Charger PIQ 3.0 & GaN], PowerPort Atom III Power Adapter https://www.amazon.com/dp/B07S8SDD4D/ref=cm_sw_r_cp_apa_i_oVmYDb8WN1NZQ

Along with a cable like this:

Anker Powerline USB-C to USB-C 3.1 Gen 1 Cable (3ft) with Power Delivery for USB Type-C Devices https://www.amazon.com/dp/B01EMIIFCU/ref=cm_sw_r_cp_apa_i_4YmYDb2MNWTVD

@GoMimo 

I have purchased and tested the accessories in the link. They work! Cheers!

https://en.community.sonos.com/wireless-speakers-228992/move-battery-drain-test-6831876

In a similar spot to everyone here. I have a few different chargers so thought I’d go through which work.

Apple 87W power brick with either Apple’s 2m USB-C cable or their short thunderbolt cable works with no issues.

Apple 96W adapter power brick didn’t work initially but worked if you first used the 87W power brick then plugged it into the 96W one...weird, right? They both support 15V 3A for 45W.

Google’s USB C 18W charger (for the Pixels) I didn’t expect this to work, and it didn’t.

Hyperjuice USB C battery, doesn’t work. Supports 5/9/12/15/20V @ 3A

The Apple 96W and Hyperjuice repeated the red led flash constantly.

I’m really hoping Sonos can release an update for its USB-C PD power profile to be less picky about how it gets its 45W.

I’m looking for a 12V solution for the speaker so shall be purchasing this which supports both 15V @ 3A and 20V @ 2.25A: https://www.amazon.com.au/Charger-Delivery-Latitude-Thinkpad-Included/dp/B07H9TLD93

In fact, I’ll be going for this one as it’s been tested for USB-C faults: https://www.amazon.com/Nekteck-Certified-Charger-Delivery-Included/dp/B075WQQG7C

Here’s a fantastic resource of USB-C chargers/batteries that details how well they abide by the USB-C spec. Given how easily we can damage our devices with USB-C, I only buy well rated items from the list.

https://docs.google.com/spreadsheets/d/1vnpEXfo2HCGADdd9G2x9dMDWqENiY2kgBJUu29f_TX8/pubhtml#

I bought this 45W Belkin charger:

https://www.belkin.com/us/p/p-f7u010/

Happy to report it is charging my Move just fine.