In order to use Microsoft azure activities under Cognitive Activities, we need to create the Microsoft Azure Form Recognizer resource and get the Api key and Endpoint Url.
You can use the existing keys from a Microsoft Azure Form Recognizer resource(if any available), or you can create a new one. To create a new resource, once you have the azure subscription, create a Form Recognizer resource in the Azure portal to get your key and endpoint. After it deploys, click Go to resource. You will need the key and endpoint from the resource you create to connect your workflow to the Form Recognizer API.
You can use the free pricing tier (F0) to try the service, and upgrade later to a paid tier for production.
Below is a screenshot of Form Recognizer resource. Just copy one of the keys to Api Key and the EndPoint to Endpoint URl.