Do the anniversaries have to be out of PROPERTIES?
Example: This is not "parsed into agenda": :PROPERTIES: :BDAY: %%(org-anniversary 1980 02 19) :END:BTW: Thanks for your advices with org-capture. I found too a very useful introductory video from Protesilaos (I wasn't able to understand the documentation till I watched this video): https://youtu.be/qCdScs4YO8k