Hadrien Van Lierde Greetings & Welcome to Microsoft Q&A forum!
However, when I open the studio for a specific resource, I am getting 150K quota (which I think was the quota before it got increased to 1M). See screenshot (this is the only resource we have in this region and we don't have any GPT4o deployment there yet so we should have full 1M quota available).
I just tried creating a new Azure OpenAI resource in WEST US region and able to see the listed TPM as per doc.
Please see below for confirmation.
I also tried this in East US and East US2 region with already existing deployments but seeing the 1000K limit.
I would suggest you, create a new Azure OpenAI resource in any of the other regions where model is available and let me know if you are still seeing the same issue?