Is the URL ennexos.sunnyportal.com/.... ? Or just sunnyportal.com/.... ? It looks like at some point they added the "powered by ennexOS" text to the classic Sunny Portal. Not sure why, because they are different. I click on that text hyperlink and it takes me to the ennexOS portal that has the systems I installed with the Datamanager M, which is an ennexOS device. A long time ago I was told all SMA monitoring was eventually going to be moved from the classic portal to the ennexOS portal, but I think they bailed on that effort, and legacy devices will die on the classic portal.
Here is a recent knowledgebase port saying that devices that have webconnect or the cluster controller only can be migrated:
I have not found it easy to find knowledgable people to talk to about this kind of thing. I think they still do most of this development in Germany. They seem to be a slow moving old company, unfortunately. I opened a case for a bug in Modbus TCP issue in their Datamanager M, and it took over a year and a half for them to come out with a fix (supposedly), and by then I was no longer working with the customer to integrate the device with their building control system. That is why SolarEdge has taken so much market share, they develop and improve faster and have better training and tech support resources.