Enable CORS support for the Form Recognizer API.
Configure cross-domain resource sharing (CORS)
Enable CORS on your storage account. Select your storage account in the Azure portal and click the CORS tab on the left pane. On the bottom line, fill in the following values. Then click Save at the top.
Allowed origins = *
Allowed methods = [select all]
Allowed headers = *
Exposed headers = *
Max age = 200