Hello Scott !
Thank you for posting on Microsoft Learn.
I checked the link and it is working fine.
If it is not working for you, try to sign in with to the Azure portal and navigate to "Azure OpenAI" then select your resource instance.
In the left pane, click Quota or Usage + quotas (under “Settings” or “Resource Management”).
If you don’t see a request option, proceed to create a support ticket.
If you're on a student subscription or trial, note that Microsoft may limit quota expansion eligibility this should be mentioned in your request.