Hi @asmecher ,
There is still the same problem with the released OJS3.
OJS2 used to have a search link on the site level which opened a form enabling to do a search in all journals of the site.
Now we do not have that link anymore and if you try domain.fi/index/search, you get the error mentioned in the first post: user.authorization.journalDoesNotPublish
So, are there any plans to provide a site level search like the one in OJS2?