When a model isn't enabled or supported in given region, don't generate the pictured error "ValidationException (properties: AWSBedrockRuntime.ValidationException.Properties(.." in the GUI. Instead, provide an error that describes the problem "Model not supported/enabled in this region". Alternatively, you could perform a "ListFoundationModels" followed by a "GetFoundationModel" API call to see what models are actually available for that specific IAM user and/or region. Then you could filter the model list accordingly in the GUI.