diff --git a/hermes-console/src/composables/subscription/use-subscription-filters-debug/useSubscriptionFiltersDebug.ts b/hermes-console/src/composables/subscription/use-subscription-filters-debug/useSubscriptionFiltersDebug.ts
index 43bc147515..83fa40cb3b 100644
--- a/hermes-console/src/composables/subscription/use-subscription-filters-debug/useSubscriptionFiltersDebug.ts
+++ b/hermes-console/src/composables/subscription/use-subscription-filters-debug/useSubscriptionFiltersDebug.ts
@@ -1,15 +1,15 @@
 import { ContentType } from '@/api/content-type';
 import { dispatchErrorNotification } from '@/utils/notification-utils';
+import type { FetchTopicContentType } from '@/composables/topic/use-topic/useTopic';
 import { fetchContentType } from '@/composables/topic/use-topic/useTopic';
+import type { Ref } from 'vue';
 import { ref } from 'vue';
 import { useGlobalI18n } from '@/i18n';
 import { useNotificationsStore } from '@/store/app-notifications/useAppNotifications';
 import { VerificationStatus } from '@/api/message-filters-verification';
 import { verifyFilters } from '@/api/hermes-client';
-import type { FetchTopicContentType } from '@/composables/topic/use-topic/useTopic';
 import type { PathFilter } from '@/views/subscription/subscription-form/subscription-basic-filters/types';
 import type { PathFilterJson } from '@/api/subscription';
-import type { Ref } from 'vue';
 
 export interface UseSubscriptionFiltersDebug {
   status: Ref<VerificationStatus | undefined>;
@@ -35,6 +35,15 @@ const toFiltersJSON = (
   };
 };
 
+// https://stackoverflow.com/a/30106551
+function b64EncodeUnicode(str: string): string {
+  return btoa(
+      encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function (match, p1) {
+        return String.fromCharCode(parseInt(p1, 16));
+      }),
+  );
+}
+
 export function useSubscriptionFiltersDebug(): UseSubscriptionFiltersDebug {
   const notificationStore = useNotificationsStore();
   const status: Ref<VerificationStatus | undefined> = ref();
@@ -52,7 +61,7 @@ export function useSubscriptionFiltersDebug(): UseSubscriptionFiltersDebug {
       );
       const response = (
         await verifyFilters(topicName, {
-          message: btoa(message),
+          message: b64EncodeUnicode(message),
           filters: filtersJSON,
         })
       ).data;