@Angela - Thanks for the update. I further investigated at my end. Visual Search Capability is available only at S9.
When I set up Bing Resources with S1, I encountered the below 401 error with below description
{"error":{"code":"401","message": "The Visual Search Operation under Visual Search API - v7 is not supported with the current subscription key and pricing tier Bing.Bundle.S1."}}
Upon further investigation in the pricing details
The Visual Search Feature is available only S9 Instances.
Reference : https://azure.microsoft.com/en-in/pricing/details/cognitive-services/search-api/
You can also check whether Bing Image Search can meet your requirement - which included in the S1 instances
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