To get a Microsoft Cognitive Services Subscription Key, go to: https://azure.microsoft.com/en-us/try/cognitive-services/. Click on Speech APIs and select Get API Key:

You may see the option to sign in or sign up:

Once signed in and signed up, under Speech services click Add:

You will may see the message, with links to the Quick-Start Guide and other Cognitive Services.
Click Got It:

You will then see your endpoint region and Keys:

You can also get a key through https://portal.azure.com/.
Log in, and select + Create a resource. In the search field, enter speech:

Select Speech:

And then Create:

Enter a name, pricing tier, resource group:

Once created, you will see your keys, region and endpoint:

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