User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.0; rv:73.0) Gecko/20100101 Firefox/73.0
Steps to reproduce:
At the moment the address list feature is not available to carddav adress books (but the button is shown ;-).
The Groupware-Solution SOGo in combination with their plugin allowed this up until now as they are removing their own provider in favour of the offical implementation
No creation and syncronisation of lists to a carddav adress book is possible
Address Lists should be creatable and be 'syncable'. I am not sure if the VLIST-Format (vcard style format for list) is SOGo specific or if it is a offial draft / part of the vcard standard but is there a way to at least make the API (or whatever) as open to allow a plugin the creation of this kind?
Another way to implement this feature would be the use of categories to mimic lists like TBSync and Cardbook did