diff --git a/lib/utils/transcription-utils.js b/lib/utils/transcription-utils.js
index 465305bd..10054512 100644
--- a/lib/utils/transcription-utils.js
+++ b/lib/utils/transcription-utils.js
@@ -378,7 +378,7 @@ module.exports = (logger) => {
         ...(typeof rOpts.hintsBoost === 'number' &&
           {GOOGLE_SPEECH_HINTS_BOOST: rOpts.hintsBoost}),
         ...(rOpts.altLanguages.length > 0 &&
-          {GOOGLE_SPEECH_ALTERNATIVE_LANGUAGE_CODES: rOpts.altLanguages.join(',')}),
+          {GOOGLE_SPEECH_ALTERNATIVE_LANGUAGE_CODES: [...new Set(rOpts.altLanguages)].join(',')}),
         ...(rOpts.interactionType &&
           {GOOGLE_SPEECH_METADATA_INTERACTION_TYPE: rOpts.interactionType}),
         ...{GOOGLE_SPEECH_MODEL: rOpts.model || (task.name === TaskName.Gather ? 'latest_short' : 'phone_call')},
@@ -407,7 +407,7 @@ module.exports = (logger) => {
         ...(rOpts.hints.length > 0 && typeof rOpts.hints[0] === 'object' &&
           {AZURE_SPEECH_HINTS: rOpts.hints.map((h) => h.phrase).join(',')}),
         ...(rOpts.altLanguages && rOpts.altLanguages.length > 0 &&
-          {AZURE_SERVICE_ENDPOINT_ID: rOpts.sttCredentials}),
+          {AZURE_SPEECH_ALTERNATIVE_LANGUAGE_CODES: [...new Set(rOpts.altLanguages)].join(',')}),
         ...(rOpts.requestSnr && {AZURE_REQUEST_SNR: 1}),
         ...(rOpts.profanityOption && {AZURE_PROFANITY_OPTION: rOpts.profanityOption}),
         ...(rOpts.azureServiceEndpoint && {AZURE_SERVICE_ENDPOINT: rOpts.azureServiceEndpoint}),