We have a strange issue here, looks like nobody, who is not a site collection administrator, can access anything under the collection (classic). The rights are goot distributed, at least, when I click on "check permissions" I can see that user x has read access, that is coming from group visitors. Even giving full control has no effect. Tested with multiple users.
The standard approval process doesn't seem to be working. User goes to link, gets access denied screen, asks for access, I get the mail, click on approve, the user gets confirmation mail, clicks on the link in the mail, and again, get the same access denied screen.
The issue is with only this one site collection. Did anyone see an something like this?
Edit:
When I, as site collection administrator visit the /_layouts/15/settings.aspx
page, I don't see the "site permissions" or any other access related options.
I can access the /_layouts/15/user.aspx
page tough.
Edit2: Looks like something is really messed up, we have a subsite that inherits permissions from the top site and our test user can access that one, but not the top site. That is, in theory, not possible. Now discussing with support.