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RayW
I had the same issue with my Kaifa MA120 not displaying the export -A values, and found this thread.
When I contacted Kaifa support, they told me that the export values are only displayed when the meter has seen at least 1kWh export.
We had only recently had solar installed and, with our battery storage, all the solar power was being fully used by our domestic load, so we hadn't exported anything.
So I forced the Inverter to export 1kWh to the grid and, sure enough, the meter then displayed the -A figure of 1kWh.
So, if your meter isn't displaying -A, it might just be because there hasn't been any export yet.
Mentioning on this thread in case this helps anyone else, as there is very little information online about Kaifa meters and the supplier instructions don't mention this either.