Uhh, oohhh, ... I hope, no one is reading this.
Yes, you are right, the plugin was not enabled. Obviously too late yesterday to think on this. Thanks for the quick help!
I have thought, the plugin was indicated as enabled on the summary screen of the module, but this was the status for the installation.
At this point I want to mention, that your installation and configuration Documentation let me decide to purchase a subscription of your tool in comparison to other, even free, tools.
And this investment in support is obviously necessary ...
Best regards
Markus