Umar Aalam Greetings & Welcome to Microsoft Q&A forum!
As mentioned on the page,
The Azure OpenAI backend decides if, when, and how much extra dynamic quota is added or removed from different deployments. It isn't forecasted or announced in advance, and isn't predictable. Azure OpenAI lets your application know there's more quota available by responding with an HTTP 429 and not letting more API calls through. To take advantage of dynamic quota, your application code must be able to issue more requests as HTTP 429 responses become infrequent.
I would suggest you, monitor quota for more insights.