I’m afraid you’ll have to wait for a fix / new app, Loek:
As alternative measuring tool, you can use a P1 dongle, if possible, like Homewizard P1 (€25).
It measures the real time power: solar power minus consumed power.
To solely measure the Envoy output, you can use a meter with power clamps, like Shelly EM. Shelly works locally, cloud connection is optional.
It’s a pricey one, but it works well, independent from brands and models
