We can configure aa PVA Bot for workstreams and when we install the voice channel demo, we can see a bot already configured for the demo workstream.
Recently in our case, the bot configured was not working and we were getting the below message on calling the workstream/voice channel configured.
“Sorry, we couldn’t serve you at this moment. Please call back later”
On removing the bot the workstream/channel was working properly.
We raised the Microsoft support ticket for the same and were suggested to create/configure a new bot instead of using the existing demo/trial one as it might give an issue because of being configured in a different environment.
On configuring a new bot the issue got fixed for us.
Hope it helps..
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