DESS: it blocks excess production grid feed-in – why?

Q&A and troubleshooting DESS
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Hello,

I have a MultiPlus-II, a 14.4kWh battery, and 2 MPPTs, with DESS (French Tempo offer) enabled with resell (at 0€) active.

Right now, I have excess solar production that I’d like to export to the grid.

The problem is: with DESS active, this export is somehow blocked. Disabling DESS re-enables feed-in.

Any idea what might be causing this blockage?

Thanks,
Matthieu