diff --git a/lib/routes/api/tts-cache.js b/lib/routes/api/tts-cache.js
index 9fc25aa9..71707ca4 100644
--- a/lib/routes/api/tts-cache.js
+++ b/lib/routes/api/tts-cache.js
@@ -188,10 +188,11 @@ router.post('/Synthesize', async(req, res) => {
       DbErrorBadRequest(`There is no available speech credential for ${vendor}${label ? ` and ${label}` : ''}`);
     }
 
-    let credentials = getSpeechCredential(speechCreds);
+    let credentials = getSpeechCredential(speechCreds, vendor, label);
     if (!credentials) {
       throw new
-      DbErrorBadRequest(`There is no available speech credential for ${vendor}${label ? ` and ${label}` : ''}`);
+      DbErrorBadRequest(`There is no available speech credential
+ for ${vendor}${label ? ` and ${label}` : ''} or tested`);
     }
     /* allow for microsoft custom region voice and api_key to be specified as an override */
     if (vendor === 'microsoft' && options.deploymentId) {