diff --git a/apps/desktop/src/hermes.ts b/apps/desktop/src/hermes.ts
index 645d0c6fa3a3..f94f0d2d741f 100644
--- a/apps/desktop/src/hermes.ts
+++ b/apps/desktop/src/hermes.ts
@@ -249,6 +249,13 @@ function profileScoped(profile?: null | string): { profile?: string } {
   return selected ? { profile: selected } : {}
 }
 
+/** Profile that profile-scoped REST/WS calls should target (null → primary).
+ *  Read-only twin of setApiRequestProfile for modules (e.g. voice playback)
+ *  that build their own connection URLs and must stay on the same backend. */
+export function getApiRequestProfile(): null | string {
+  return _apiProfile
+}
+
 /** Options for a plugin REST call — mirrors the app's own `hermesDesktop.api`
  *  shape, minus the path (which is namespace-derived). */
 export interface PluginRestOptions {
diff --git a/apps/desktop/src/lib/voice-playback.ts b/apps/desktop/src/lib/voice-playback.ts
index 80d9a3f22a2e..a40948931629 100644
--- a/apps/desktop/src/lib/voice-playback.ts
+++ b/apps/desktop/src/lib/voice-playback.ts
@@ -1,6 +1,6 @@
 import { resolveGatewayWsUrl } from '@hermes/shared'
 
-import { speakText } from '@/hermes'
+import { getApiRequestProfile, speakText } from '@/hermes'
 import {
   $voicePlayback,
   setVoicePlaybackState,
@@ -74,9 +74,11 @@ async function resolveSpeakStreamUrl(): Promise<null | string> {
   }
 
   try {
-    // Mint a fresh credential (single-use ticket in OAuth mode), then swap the
-    // gateway endpoint for the PCM one — auth is shared across WS routes.
-    const wsUrl = await resolveGatewayWsUrl(desktop, await desktop.getConnection())
+    // Mint a fresh credential (single-use ticket in OAuth mode) for the
+    // ACTIVE profile's backend, then swap the gateway endpoint for the PCM
+    // one — auth is shared across WS routes.
+    const profile = getApiRequestProfile()
+    const wsUrl = await resolveGatewayWsUrl(desktop, await desktop.getConnection(profile))
     const url = new URL(wsUrl)
 
     if (!url.pathname.endsWith('/api/ws')) {
@@ -85,6 +87,12 @@ async function resolveSpeakStreamUrl(): Promise<null | string> {
 
     url.pathname = url.pathname.replace(/\/api\/ws$/, '/api/audio/speak-stream')
 
+    // The backend resolves the TTS provider chain from this profile's
+    // config/.env (same seam as /api/pty?profile=).
+    if (profile) {
+      url.searchParams.set('profile', profile)
+    }
+
     return url.toString()
   } catch {
     return null