amazon web services - Alexa SSML not playing -

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i trying ask , tried dummy example ssml. using amazon lambda , python. if test code lambda console expected output:

{   "version": "1.0",   "response": {     "outputspeech": {       "text": "<speak><audio src='https://s3.amazonaws.com/aws-website-resources-1183x/dice-die-roll.mp3' />three</speak>",       "type": "ssml"     },     "shouldendsession": true,     "card": {       "content": "three.",       "type": "simple",       "title": "dice"     }   } }

when go alexa service simulator , try request, text in output speech gone, "listen" button in console disabled , if try on echo, doesn't play anything:

{   "version": "1.0",   "response": {     "outputspeech": {       "type": "ssml"     },     "card": {       "content": "three.",       "title": "dice",       "type": "simple"     },     "shouldendsession": true   } }

if copy/paste ssml <speak><audio src='https://s3.amazonaws.com/aws-website-resources-1183x/dice-die-roll.mp3' />three</speak> voice simulator can play , played expected. i've converted mp3 file using ffmpeg: ffmpeg -y -i a.mp3 -ar 16000 -ab 48k -codec:a libmp3lame -ac 1 output.mp3 , understand amazon's s3 should trusted, may problem? i've tried using single , double quotes in ssml , tried escaping quotes no avail. knows should into?

dumb mistake. output should in ssml instead of text.

"outputspeech": {       "ssml": "<speak><audio src='https://s3.amazonaws.com/aws-website-resources-1183x/dice-die-roll.mp3' />three</speak>",       "type": "ssml"     },

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