Unable to add or configure "Kaspersky Protection" extension in Microsoft Edge.

Hi,
a related topic with answer from the developers,
https://techcommunity.microsoft.com/t5/Discussions/Kaspersky-Security-Cloud-Free-Extension/m-p/875523

Quoting Elliot Kirk 

as I understand it extensions that require a companion app, such as Kaspersky Security Cloud, will need to make small changes to support the new versions of Microsoft Edge.  Some of these software vendors have decided to wait until there is a Stable channel version before making the required changes.  I am not aware if Kaspersky is in this list or not.  Thanks - Elliot

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in my own experience with Kaspersky products, they only fully support stable products, so things like Windows insider or Edge insider which are beta software are not fully supported,

you need to wait until the final and stable version of the new Microsoft Edge browser is released and then Kaspersky will officially support it as well,

Thanks