@たむら Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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Please navigate to the Azure Open AI Studio --> Quota section and check the usage for both Global
and Standard
deployment and check its usage:
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If the usage is completely used, you can click on the Request quota option.
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GPT-4o and GPT-4o mini are available for standard and global-standard model deployment.
You need to create or use an existing resource in a supported standard or global standard region where the model is available.
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If you tried under the Global model deployment and it fails, try within Standard deployment as shown below:
Standard deployment available region:
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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.