Thanks for reaching out to us, as the pricing document -
The new PII is part of the Language conversation API preview that was launched at //BUILD 2022. The new feature is designed to process call center transcripts and chat conversations. The feature is offered free of charge until GA.
So it will be free for now.
Orchestration workflow only charges you for requests to the Orchestration endpoint. If the orchestration workflow project routes your request to another conversational language understanding, custom question answering, or LUIS project, you are not additionally charged for the call to that service.
But please be aware that, you will need to pay for the endpoint hosting as below screenshot -
I hope this helps, thanks a lot.
-Please kindly accept the answer if you feel helpful to support the community, thanks a lot.