You are welcome 🙂

Hi Tosin,
The problem with above code is the option group name and section name.

Please find it updated here.

<?php
/*
* Plugin Name: BuddyPress Registration Control
* Description: Allows administrators to enable or disable user registration and select a URL to redirect to when registration is disabled.
* Version: 1.0
*/

// Register the new setting in the BuddyPress options group
function custom_bp_register_settings() {
	register_setting( 'buddypress', 'bp-disable-site-registration', 'sanitize_text_field' );
	register_setting( 'buddypress', 'bp-disable-site-registration-redirection-url', 'sanitize_text_field' );
}
add_action( 'bp_register_admin_settings', 'custom_bp_register_settings' );

// Add the new setting to the BuddyPress options page
function custom_bp_add_settings_field() {
	add_settings_field(
		'bp-disable-site-registration',
		__( 'Registration', 'buddypress' ),
		'custom_bp_settings_field_html',
		'buddypress',
		'bp_main',
		array(
			'label_for' => 'bp-disable-site-registration',
		)
	);
	add_settings_field(
		'bp-disable-site-registration-redirection-url',
		__( 'Redirection URL', 'buddypress' ),
		'custom_bp_settings_redirection_url_html',
		'buddypress',
		'bp_main',
		array(
			'label_for' => 'bp-disable-site-registration-redirection-url',
		)
	);
}
add_action( 'bp_register_admin_settings', 'custom_bp_add_settings_field', 10, 1 );

// Output the HTML for the setting field
function custom_bp_settings_field_html() {
	$value = get_option( 'bp-disable-site-registration', 'open' );
	?>
	<select name="bp-disable-site-registration" id="bp-disable-site-registration">
		<option value="open" <?php selected( $value, 'open' ); ?>><?php _e( 'Open', 'buddypress' ); ?></option>
		<option value="closed" <?php selected( $value, 'closed' ); ?>><?php _e( 'Closed', 'buddypress' ); ?></option>
	</select>
	<?php
}

// Output the HTML for the redirection URL field
function custom_bp_settings_redirection_url_html() {
	$value = get_option( 'bp-disable-site-registration-redirection-url' );
	?>
	<input type="text" name="bp-disable-site-registration-redirection-url" id="bp-disable-site-registration-redirection-url" value="<?php echo esc_attr( $value ); ?>" />
	<?php
}

// Redirect users if registration is closed
function custom_bp_redirect_registration() {
	if ( get_option( 'bp-disable-site-registration' ) === 'closed' ) {
		wp_redirect( get_option( 'bp-disable-site-registration-redirection-url' ) );
		exit;
	}
}
add_action( 'bp_screens', 'custom_bp_redirect_registration' );

I did not go through other sections of your code. In case you need assistance there, I can look into that.

Regards
Brajesh

Hi,
It seems your subscription for the Moderation tools expired. That’s why you were unable to download it.

I have shared a copy via google drive. If it asks for login, Please use the link from my next reply. I will be marking the link private after next 24 hours.

Regards
Brajesh