I didn’t know Birthday Calendar Adapter but it seems to do exactly what I wanted. Thanks for your answer.
LG G5 Contacts App
I configured a Woelkli account in DavDroid. I can see the account in the Calendar App but not in the Contacts App.
Have you tried Google Contacts?
@rfc2822 I wasn’t patient enough. I got fed up and took a nap. I just got up now and the default LG G5 contacts app sees the Woelkli address books.
Thank you for replying.