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Do you have required permissions to create the resources?
Viewing quota and deploying models requires the Cognitive Services Usages Reader role. This role provides the minimal access necessary to view quota usage across an Azure subscription. To learn more about this role and the other roles you will need to access Azure OpenAI, consult our Azure role-based access (Azure RBAC) guide.
This role can be found in the Azure portal under Subscriptions > Access control (IAM) > Add role assignment > search for Cognitive Services Usages Reader.This role must be applied at the subscription level, it does not exist at the resource level.
If you do not wish to use this role, the subscription Reader role will provide equivalent access, but it will also grant read access beyond the scope of what is needed for viewing quota and model deployment.
If you have access and still seeing this issue, then please check the regional quota limits.
Also, check Manage Azure OpenAI Service quota for more information.
I hope this helps. Do let me know if you have any further queries.