direct-line-speech sample needs CORS fix

Is it an issue related to Adaptive Cards?

No response

Is this an accessibility issue?

No response

What version of Web Chat are you using?

Latest production

Which distribution are you using Web Chat from?

Bundle (webchat.js)

Which hosting environment does this issue primarily affect?

Web apps

Which browsers and platforms do the issue happened?

No response

Which area does this issue affect?

No response

Which theme pack does this issue affect?

I did not test it on other theme packs

What is the public URL for the website?

https://github.com/microsoft/BotFramework-WebChat/blob/main/samples/03.speech/a.direct-line-speech/index.html

Please describe the bug

When running sample for directline to speech get this error:

Access to fetch at 'https://webchat-mockbot-streaming.azurewebsites.net/speechservices/token' from origin 'https://microsoft.github.io' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

Do you see any errors in console log?

yes, this one:

Access to fetch at 'https://webchat-mockbot-streaming.azurewebsites.net/speechservices/token' from origin 'https://microsoft.github.io' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

and:

POST https://webchat-mockbot-streaming.azurewebsites.net/speechservices/token net::ERR_FAILED 500 (Internal Server Error)

and: 

TypeError: Failed to fetch
    at fetchCredentials (a.direct-line-speech/:42:29)
    at lj (webchat.js:2:3531402)
    at fj (webchat.js:2:3531974)
    at Object.R2 [as createDirectLineSpeechAdapters] (webchat.js:2:3995682)
    at a.direct-line-speech/:57:47
    at a.direct-line-speech/:70:9

How to reproduce the issue?

1. Just open the sample: https://microsoft.github.io/BotFramework-WebChat/03.speech/a.direct-line-speech/
2. Open browser devtools

What do you expect?

Working sample

What actually happened?

Blank page, no errors displayed on sample:

Do you have any screenshots or recordings to repro the issue?

No response

Adaptive Card JSON

Additional context

No response

Start with samples/03.speech/a.direct-line-speech/index.html and open the deployed sample with browser devtools to reproduce the failed request. Trace the fetch to the speechservices/token endpoint and identify the CORS failure; done means the sample loads without a blank page or blocked-token error.