Multisite – One user allowed access to all sites?

You should be able to do this using the WordPress MU Domain Mapping plugin. I’ve just tested this and it seems to work if I go to the main site and login I’m then logged in on all the sub sites.

I think you might need to tweek the domain options for the plugin under wp-admin/network/settings.php?page=dm_admin_page for this to work.

Reference

WordPress MU Domain Mapping

Single Sign On to all sites in my entire WP Network

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