@Quân Thanks for reaching out to us again, one way we can think about is not using all in one resource but using separate resources for different group. Though all in one resource is recommended now, resource for single product is still available -
Does this make sense? At the meantime, you can leverage the roles to do it, there are a lot of build in roles for Azure AI Services resource for only one product read/write as below, as you mentioned, it not worked for you, what is the problem?
Please let me know how it works for you, thanks a lot. Regards, Yutong