Hi Kieu Truong
I'm sorry but urrently, access to this service is granted only by application. You can apply for access to Azure OpenAI by completing the form at https://aka.ms/oai/access. Open an issue on this repo to contact us if you have an issue. but I guess right now only company requests are considered in case of of private accounts this might not work currently. Hopefully it will be released soon to all. So with personal ACC this wont work
If you want to learn you can go through the modules and articles on microsft learn https://learn.microsoft.com/en-us/training/modules/get-started-openai/
All the very best for the exams
If this helps kindly accept the answer thanks much.