Enable smart user registration across your WordPress Multisite network – allow users with an existing account to register on other subsites using the  …

Nick de Wit

Enable smart user registration across your WordPress Multisite network – allow users with an existing account to register on other subsites using the same email, with subsite-specific role assignment. Fully translation-ready!
By default, WordPress Multisite prevents new user registrations if the email address already exists anywhere in the network. This is a major issue for platforms where each subsite functions as a separate entity – such as coach directories, SaaS portals, multilingual communities, or franchise networks.
Multisite User Registration Fix lifts this restriction by: 
– Detecting if a registering user’s email already exists in the network 
– Automatically assigning them to the current subsite with a role you define 
– Letting you manage roles per subsite from one central network admin screen 
– Sending a confirmation email when users are added to new subsites 
– Preventing registration errors due to duplicate email conflicts 
– Supporting full translation and multilingual setup (via .pot, WPML, Loco Translate, Poedit)
Works perfectly with booking and membership plugins like Amelia, MemberPress, WooCommerce, and more.
<h3>Features</h3>
<ul>
<li>🐞 Optional debug logging for admins (toggle via settings page, plugin.org-safe)</li>
<li>✅ Seamless cross-subsite user registration using the same email</li>
<li>🛠️ Centralized role assignment per subsite (via Network Admin)</li>
<li>✉️ Sends email confirmation upon successful subsite assignment</li>
<li>🧩 MU-plugin compatible – works automatically when dropped into <code>mu-plugins</code></li>
<li>💡 Supports standard WordPress registration, custom booking flows, and third-party plugins</li>
<li>🌐 Fully translation-ready – includes .pot file and supports multilingual WordPress networks</li>
</ul>
<h3>Notes</h3>
Ideal for multisite setups where users should be able to register on multiple subsites with the same email – but require different roles and access levels per site. Created for platforms like coach directories, multilingual networks, e-learning portals, SaaS systems, and more.
Plugin developed by the team at https://detransformatietafel.nl ✨

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