Issue Wordpress Page not indexable

[Loonx]

Hey all,
so I have an wordpress installation on my plesk instance. I set the toggle to let search engines index my pages.

Expand/Collapse Block: Pictures of setting

I set up google Mybusiness and added my site to search console. After 3 days I got an email telling me that google is not able to index my site because of Noindex in headers. I checked with Index / No Index and indeed, my site is indexable. Is this a common problem? How can I resolve this?

 

[Bitpalast]

Maybe there are single pages or files that carry the noindex attribute while the majority of pages does not?