diff --git a/omnisend/class-omnisend-core-bootstrap.php b/omnisend/class-omnisend-core-bootstrap.php
index 0d9d084..44d50ea 100644
--- a/omnisend/class-omnisend-core-bootstrap.php
+++ b/omnisend/class-omnisend-core-bootstrap.php
@@ -4,7 +4,7 @@
  *
  * Plugin Name: Omnisend
  * Description: Omnisend main plugin that enables integration with Omnisend.
- * Version: 1.1.3
+ * Version: 1.1.4
  * Author: Omnisend
  * Author URI: https://www.omnisend.com
  * Developer: Omnisend
@@ -22,7 +22,7 @@
 
 defined( 'ABSPATH' ) || die( 'no direct access' );
 
-const OMNISEND_CORE_PLUGIN_VERSION = '1.0.0';
+const OMNISEND_CORE_PLUGIN_VERSION = '1.1.4';
 const OMNISEND_CORE_SETTINGS_PAGE  = 'omnisend';
 const OMNISEND_CORE_PLUGIN_NAME    = 'Email Marketing by Omnisend';
 
@@ -71,13 +71,13 @@ public static function load_omnisend_admin_styles(): void {
 					'roboto.css',
 					plugin_dir_url( __FILE__ ) . 'assets/fonts/roboto/roboto.css?' . time(),
 					array(),
-					'1.1.3',
+					'1.1.4',
 				);
 				wp_enqueue_style(
 					'styles.css',
 					plugin_dir_url( __FILE__ ) . 'styles/styles.css?' . time(),
 					array(),
-					'1.1.3',
+					'1.1.4',
 				);
 			}
 		}
diff --git a/omnisend/includes/Internal/class-connection.php b/omnisend/includes/Internal/class-connection.php
index b37d792..35641eb 100644
--- a/omnisend/includes/Internal/class-connection.php
+++ b/omnisend/includes/Internal/class-connection.php
@@ -15,26 +15,46 @@ class Connection {
 
 	public static function display(): void {
 		$connected = Options::is_store_connected();
+		// phpcs:ignore WordPress.WP.CapitalPDangit.MisspelledInText
+		$wordpress_platform = 'wordpress';
 
 		if ( ! $connected && ! empty( $_POST['action'] ) && 'connect' == $_POST['action'] && ! empty( $_POST['api_key'] ) ) {
 			check_admin_referer( 'connect' );
 			$api_key  = sanitize_text_field( wp_unslash( $_POST['api_key'] ) );
-			$brand_id = self::get_brand_id( $api_key );
+			$response = self::get_account_data( $api_key );
+			$brand_id = $response['brandID'];
 
-			if ( $brand_id ) {
-				// Set credentials so snippet can be added for snippet verification.
-				Options::set_api_key( $api_key );
-				Options::set_brand_id( $brand_id );
+			if ( ! $brand_id ) {
+				echo '<div class="notice notice-error"><p>The connection didn’t go through. Check if the API key is correct.</p></div>';
+				require_once __DIR__ . '/../../view/connection-form.html';
+				return;
+			}
 
+			if ( $response['verified'] === true && $response['platform'] !== wordpress_platform ) {
+				echo '<div class="notice notice-error"><p>This Omnisend account is already connected to non-WordPress site. Log in to access it.
+				<a target="_blank" href="https://www.omnisend.com/customer-support/">Contact our support</a> if you have other issues.</p></div>';
+				require_once __DIR__ . '/../../view/connection-form.html';
+				return;
+			}
+
+			$connected = false;
+			if ( $response['platform'] === wordpress_platform ) {
+				$connected = true;
+			}
+
+			if ( $response['platform'] === '' ) {
 				$connected = self::connect_store( $api_key );
-				if ( $connected ) {
-					Options::set_store_connected();
-				}
+			}
+
+			if ( $connected ) {
+				Options::set_api_key( $api_key );
+				Options::set_brand_id( $brand_id );
+				Options::set_store_connected();
 			}
 
 			if ( ! $connected ) {
 				Options::disconnect(); // Store was not connected, clean up.
-				echo '<div class="notice notice-error"><p>API key is not valid.</p></div>';
+				echo '<div class="notice notice-error"><p>The connection didn’t go through. Check if the API key is correct.</p></div>';
 			}
 		}
 
@@ -46,7 +66,7 @@ public static function display(): void {
 		require_once __DIR__ . '/../../view/connection-success.html';
 	}
 
-	private static function get_brand_id( $api_key ): string {
+	private static function get_account_data( $api_key ): array {
 		$response = wp_remote_get(
 			OMNISEND_CORE_API_V3 . '/accounts',
 			array(
@@ -65,7 +85,7 @@ private static function get_brand_id( $api_key ): string {
 
 		$arr = json_decode( $body, true );
 
-		return is_array( $arr ) && ! empty( $arr['brandID'] ) && is_string( $arr['brandID'] ) ? $arr['brandID'] : '';
+		return is_array( $arr ) ? $arr : array();
 	}
 
 	private static function connect_store( $api_key ): bool {
@@ -122,13 +142,13 @@ public static function connect_with_omnisend_for_woo_plugin(): void {
 			return;
 		}
 
-		$brand_id = self::get_brand_id( $api_key );
-		if ( ! $brand_id ) {
+		$response = self::get_account_data( $api_key );
+		if ( ! $response['brandID'] ) {
 			return;
 		}
 
 		Options::set_api_key( $api_key );
-		Options::set_brand_id( $brand_id );
+		Options::set_brand_id( $response['brandID'] );
 		Options::set_store_connected();
 	}
 }
diff --git a/omnisend/readme.txt b/omnisend/readme.txt
index bfbb7ea..3f826cb 100644
--- a/omnisend/readme.txt
+++ b/omnisend/readme.txt
@@ -1,11 +1,11 @@
 === Email Marketing by Omnisend ===
 Plugin Name: Email Marketing by Omnisend
 Contributors: Omnisend
-Tags: form, email marketing, web tracking, subscriber collection
+Tags: email marketing, marketing, newsletter, sms, form
 Requires at least: 4.7.0
 Tested up to: 6.4
 Requires PHP: 7.1
-Stable tag: 1.1.3
+Stable tag: 1.1.4
 License: GPLv3 or later
 URI: http://www.gnu.org/licenses/gpl-3.0.html
 
@@ -54,6 +54,10 @@ Read Omnisend [Terms of Use](https://www.omnisend.com/terms)
 
 == Changelog ==
 
+= 1.1.4 =
+
+* Improve connection messages
+
 = 1.1.3 =
 
 * Update build process