This looks like you don't have access to fine-tune in your current subscription. Could you open a support request and choose 'issue type' of 'service and subscription limits', choose your subscription and quota type 'Cognitive Services'. You can then describe this issue in the description. This will let the support team see your subscription and root cause the issue.
Here is more detail on how to create a support request: https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
Thanks!
Chris