bp_core_signup_disable_inactive( WP_User|WP_Error|null $user = null, string $username = '', string $password = '' )

function bp_core_signup_disable_inactive( $user = null, $username = '', $password ='' ) {
	// Login form not used.
	if ( empty( $username ) && empty( $password ) ) {
		return $user;
	}

	// An existing WP_User with a user_status of 2 is either a legacy
	// signup, or is a user created for backward compatibility. See
	// {@link bp_core_signup_user()} for more details.
	if ( is_a( $user, 'WP_User' ) && 2 == $user->user_status ) {
		$user_login = $user->user_login;

	// If no WP_User is found corresponding to the username, this
	// is a potential signup.
	} elseif ( is_wp_error( $user ) && 'invalid_username' == $user->get_error_code() ) {
		$user_login = $username;

	// This is an activated user, so bail.
	} else {
		return $user;
	}

	// Look for the unactivated signup corresponding to the login name.
	$signup = BP_Signup::get( array( 'user_login' => sanitize_user( $user_login ) ) );

	// No signup or more than one, something is wrong. Let's bail.
	if ( empty( $signup['signups'][0] ) || $signup['total'] > 1 ) {
		return $user;
	}

	// Unactivated user account found!
	// Set up the feedback message.
	$signup_id = $signup['signups'][0]->signup_id;

	$resend_url_params = array(
		'action' => 'bp-resend-activation',
		'id'     => $signup_id,
	);

	$resend_url = wp_nonce_url(
		add_query_arg( $resend_url_params, wp_login_url() ),
		'bp-resend-activation'
	);

	$resend_string = '<br /><br />' . sprintf( __( 'If you have not received an email yet, <a href="%s">click here to resend it</a>.', 'buddyboss' ), esc_url( $resend_url ) );

	return new WP_Error( 'bp_account_not_activated', __( '<strong>ERROR</strong>: Your account has not been activated. Check your email for the activation link.', 'buddyboss' ) . $resend_string );
}