Soumaly Saha This could be due to the fine tuning unavailability for new customers as it is turned off for all regions.
You can see the same on models page as well.
Unfortunately, we don't have any ETA at this moment when fine tuning opens again.
The models page will be updated as soon as we open up regions for fine tuning and users should be able to submit the requests when it is made available.
If you have previously fine-tuned & deployed in a region, then you can fine tune in that region if it's available.
Alternatively, you could use Azure OpenAI on your data feature with Open AI which might remove the need / requirement for fine tuning.
I hope this helps! Let me know if you have any further questions.