I quickly went through Yoast’s article and it has some useful information, thanks for posting the link.
However I couldn’t find any solution to my problem there.
One solution for the kind of problem I have I found here: https://https://www.blogtrainer.de/2009/11/06/google-blogsuche-nicht-gefunden
However it’s in german. Basically it tells you to remove “no follow” tags from your feed.
Anyway it wasn’t the solution for my case.
