diff --git a/includes/service-providers/active_campaign/class-newspack-newsletters-active-campaign.php b/includes/service-providers/active_campaign/class-newspack-newsletters-active-campaign.php
index b6598ec8b..3098bb711 100644
--- a/includes/service-providers/active_campaign/class-newspack-newsletters-active-campaign.php
+++ b/includes/service-providers/active_campaign/class-newspack-newsletters-active-campaign.php
@@ -1066,7 +1066,7 @@ public function sync( $post ) {
 		// Retrieve and store campaign data.
 		$data = $this->retrieve( $post->ID, true );
 		if ( is_wp_error( $data ) ) {
-			set_transient( $transient_name, __( 'Error syncing with ESP. ', 'newspack-newsletters' ) . $data->get_error_message(), 45 );
+			set_transient( $transient_name, __( 'ActiveCampaign sync error: ', 'newspack-newsletters' ) . $data->get_error_message(), 45 );
 			return $data;
 		} else {
 			$data = array_merge( $data, $sync_data );
diff --git a/includes/service-providers/constant_contact/class-newspack-newsletters-constant-contact.php b/includes/service-providers/constant_contact/class-newspack-newsletters-constant-contact.php
index 9498da041..08fb4c9c1 100644
--- a/includes/service-providers/constant_contact/class-newspack-newsletters-constant-contact.php
+++ b/includes/service-providers/constant_contact/class-newspack-newsletters-constant-contact.php
@@ -884,7 +884,7 @@ public function sync( $post ) {
 
 			return $campaign_result;
 		} catch ( Exception $e ) {
-			set_transient( $transient_name, __( 'Error syncing with ESP. ', 'newspack-newsletters' ) . $e->getMessage(), 45 );
+			set_transient( $transient_name, 'Constant Contact campaign sync error: ' . wp_specialchars_decode( $e->getMessage(), ENT_QUOTES ), 45 );
 			return new WP_Error( 'newspack_newsletters_constant_contact_error', $e->getMessage() );
 		}
 	}
diff --git a/includes/service-providers/mailchimp/class-newspack-newsletters-mailchimp.php b/includes/service-providers/mailchimp/class-newspack-newsletters-mailchimp.php
index dbdf7a9b0..c1c67057a 100644
--- a/includes/service-providers/mailchimp/class-newspack-newsletters-mailchimp.php
+++ b/includes/service-providers/mailchimp/class-newspack-newsletters-mailchimp.php
@@ -13,6 +13,8 @@
 use Newspack\Newsletters\Send_Lists;
 use Newspack\Newsletters\Send_List;
 
+use function cli\err;
+
 /**
  * Main Newspack Newsletters Class.
  */
@@ -1146,13 +1148,11 @@ public function sync( $post ) {
 
 			if ( $mc_campaign_id ) {
 				$campaign_result = $this->validate(
-					$mc->patch( "campaigns/$mc_campaign_id", $payload ),
-					__( 'Error updating existing campaign draft.', 'newspack_newsletters' )
+					$mc->patch( "campaigns/$mc_campaign_id", $payload )
 				);
 			} else {
 				$campaign_result = $this->validate(
-					$mc->post( 'campaigns', $payload ),
-					__( 'Error creating campaign.', 'newspack_newsletters' )
+					$mc->post( 'campaigns', $payload )
 				);
 				$mc_campaign_id  = $campaign_result['id'];
 				update_post_meta( $post->ID, 'mc_campaign_id', $mc_campaign_id );
@@ -1177,7 +1177,7 @@ public function sync( $post ) {
 				'content_result'  => $content_result,
 			];
 		} catch ( Exception $e ) {
-			set_transient( $transient_name, 'Mailchimp: ' . $e->getMessage(), 45 );
+			set_transient( $transient_name, 'Mailchimp campaign sync error: ' . wp_specialchars_decode( $e->getMessage(), ENT_QUOTES ), 45 );
 			return new WP_Error( 'newspack_newsletters_mailchimp_error', $e->getMessage() );
 		}
 	}
diff --git a/src/editor/mjml/index.js b/src/editor/mjml/index.js
index 22df39092..4f497f2af 100644
--- a/src/editor/mjml/index.js
+++ b/src/editor/mjml/index.js
@@ -11,7 +11,7 @@ import { refreshEmailHtml } from '../../newsletter-editor/utils';
 /**
  * Internal dependencies
  */
-import { fetchNewsletterData, fetchSyncErrors } from '../../newsletter-editor/store';
+import { fetchNewsletterData, fetchSyncErrors, updateNewsletterDataError } from '../../newsletter-editor/store';
 import { getServiceProvider } from '../../service-providers';
 
 /**
@@ -105,7 +105,7 @@ function MJML() {
 					} );
 				} )
 				.catch( e => {
-					console.warn( e ); // eslint-disable-line no-console
+					updateNewsletterDataError( e );
 				} )
 				.finally( () => {
 					unlockPostSaving( 'newspack-newsletters-refresh-html' );
@@ -116,10 +116,10 @@ function MJML() {
 					const isSupportedESP = serviceProviderName && 'manual' !== serviceProviderName && supportedESPs?.includes( serviceProviderName );
 					if ( isSupportedESP ) {
 						// Rehydrate ESP newsletter data after completing sync.
-						fetchNewsletterData( postId );
-
-						// Check for sync errors after refreshing the HTML.
-						fetchSyncErrors( postId );
+						fetchNewsletterData( postId ).then( () => {
+							// Check for sync errors after refreshing the HTML.
+							fetchSyncErrors( postId );
+						} );
 					}
 				} );
 		}
diff --git a/src/newsletter-editor/store.js b/src/newsletter-editor/store.js
index 1e3c66ed5..3e26f2beb 100644
--- a/src/newsletter-editor/store.js
+++ b/src/newsletter-editor/store.js
@@ -126,6 +126,7 @@ export const fetchNewsletterData = async postId => {
 		updateNewsletterDataError( error );
 	}
 	updateIsRetrieving( false );
+	return true;
 };
 
 // Dispatcher to fetch any errors from the most recent sync attempt.
@@ -147,6 +148,7 @@ export const fetchSyncErrors = async postId => {
 		updateNewsletterDataError( error );
 	}
 	updateIsRetrieving( false );
+	return true;
 }
 
 // Dispatcher to fetch send lists and sublists from the connected ESP and update the newsletterData in store.