@Andre Kassis I have tried to get a token using eastus region for my speech resource and the service seems to provide a token when requested. Here is the command I used:
curl -v -X POST "https://eastus.api.cognitive.microsoft.com/sts/v1.0/issueToken" -H "Content-type: application/x-www-form-urlencoded" -H "Content-Length: 0" -H "Ocp-Apim-Subscription-Key: <your_subscription_key_here>"
Could you please check with above by replacing the placeholder with your key available from Azure portal for this resource? Also ensure the region is the same as shown in the Azure portal.
Also, you will not be able to access the endpoint for any region or your resource endpoint from the browser.