Power delivery from dock not working

I’ve got a Belkin Thunderbolt3 dock which supports 85W power delivery. When I plug it in, it recognizes the dock (my external monitor and ethernet appear) and “acpi” shows that it’s getting power, but the battery discharges.

It’s almost like the laptop isn’t negotiating power delivery with the dock, so it’s just getting some minimal charge.

Any suggestion on how to troubleshoot this?

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