As communicated to all API subscribers in email, we will on June 15. 2024 start enforcing the use of subscription key to all our API calls. This means if your API consumers are not applying a valid subscription key in the requests, the request will fail with a Http 401 authentication message.
Use the instructions for applying subscription key in header field (“Ocp-Apim-Subscription-Key”) in the "Accessing the API" guide.