simonjonharding

In tests I can confirm that a user signed up to sub-domain 1 can log in and interact with profiles and forums on sub-domain 2 – hence the problem.

As I understand it WP User log in access to all network sites is by design, in that all network users have access to all sites should they choose to.
Viewing other sites is not the issue, nor is the being able to log in to each site really, but then having write access to a site that the user didnt register to is a problem.

I could probably get by with WP not auto assigning a subscriber role to a new user of a sub-domain and doing it manually once the sites admin has approved the registration, since the principle interaction on each site is via Buddypress and bbpress which has its own role structure.
But letting users of one site have write access to another sites forums and messaging etc is a deal breaker.
Unless I can find a way around that I will have to ditch the multisite platform and stick to single installs for each site, which I would rather avoid!

That callback based on the current site id works a treat, thanks.

Now I just need to find a solution to two other registration/access issues.

Firstly, why WordPress does not auto assign “subscriber” role to a new user, instead the field says “not assigned”, with just the Buddypress role allocated as “participant”.
I really dont want to have to manually assign “subscriber” to every user of every sub-domain.

Secondly, how I can prevent multisite users who register on one sub-domain from logging in on other subdomains. I need to limit each user to the site they register on.

Whilst not directly related to BP Registration Options, just wondered if you had any suggestions?