"secondary device" greyed out

Hello,
I’ve setup my PV site with success. I would like to add my consumption data coming from a different device.
The option “secondary device” is greyed.
I read on this forum that “it will probably be a donation option”.
Is it still “probably” and therefore not yet? Or do I have to donate in order to free up the option?
Thank you in advance - Bob

The secondary device is a donation bonus feature.

List donation features -