Subdirectory blogs not working unless logged in.

Hi all,

As mentioned in title, my subdirectory-based blogs return the “This is somewhat embarrassing, isn’t it?” error, unless you are actively logged in.

URL format is: https://server/myprofile/testblog

If I log into wp-admin and then try the same URLs they work fine.

The blogs are all set to public.

I have a bad feeling this is something very basic, but I can’t for the life of me figure it out. Any help greatly appreciated.