This may be due to Invalid Credentials. If the credentials have expired, generate new ones and update your configuration accordingly. Verify that the account or service principal used for authentication has the necessary permissions to access the Form Recognizer service. Mostly it could arise because of these two errors. Pls check and let me know if you need any further assistance.
Unauthorised Access
Karthini Balakrishnan
45
Reputation points
Unauthorized: Access to the specified resource is denied. Please check your authentication credentials and ensure that you have the necessary permissions to access the Form Recognizer service.