Hi @Gurveer Singh ,
I'm glad your issue was resolve and thanks for posting the solution so that others experiencing the same thing can easily reference this!
Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept " the answer.
Issue:
-You tried making an outbound call using azure communication services but got this error:
"Our services aren't available right now. We're working to restore all services as soon as possible. Please check back soon."
-You tested it using postman and defined the access token in authorization to, form and callbackuri in body and content-type in header.
Solution:
"we cannot directly access the endpoint as a rest API endpoint there are extensions to it that we need to add so that we can reach the correct destination like in order to place a call using Azure communication services we need to use this endpoint.
{endpoint}/calling/callConnections?api-version=2021-08-30-preview
FYI this will not work until you provide the access token"
Thanks again for sharing your solution.
Best,
Grace