How to solve 401 error: "ClassifyImageUrl Operation under Custom_Vision_Prediction_3.1 is not supported"

Question

Hello! I am trying to get prediction of image classification by API using the model which was trained previously on the customvision.ai web portal (meaning it was trained manually, not by API).

And I am getting this error when calling predictor.classify_image_url():

'error': {'code': '401', 'message': 'The ClassifyImageUrl Operation under Custom_Vision_Prediction_3.1 is not supported with the current subscription key and pricing tier Custom_Vision.Training.S0.'

My code below:

ENDPOINT = "https://westeurope.api.cognitive.microsoft.com/"
training_key = [HIDDEN]
prediction_key = [HIDDEN]
project_id = [HIDDEN]

training_credentials = ApiKeyCredentials(in_headers={"Training-key": training_key})
trainer = CustomVisionTrainingClient(ENDPOINT, training_credentials)

iterations: list[Iteration] = trainer.get_iterations(project_id)

prediction_credentials = ApiKeyCredentials(in_headers={"Prediction-key": prediction_key})
predictor = CustomVisionPredictionClient(ENDPOINT, prediction_credentials)

results: ImagePrediction = predictor.classify_image_url(project_id, iterations[0].name, url)

I used this guide: https://learn.microsoft.com/en-us/azure/ai-services/Custom-Vision-Service/quickstarts/image-classification

I also have double-checked my keys, both are actual.

What I need to solve this issue?

May be to find another endpoint for predictor (if yes, give me please the exact instructions where I can find it in my Azure portal) or something else...