Hi @Jochem G,
Thank you for reaching out to Microsoft Q&A forum!
Since you're using a free developer account, it's important to note that access to certain models, including GPT-4 Turbo (2024-08-01-preview), may be restricted. Free or trial-tier subscriptions typically have limited access to advanced models, and GPT-4 Turbo might not be available under this tier. Additionally, availability can vary by region, and the regions you've tried (France Central, Sweden Central, US East) may not yet have GPT-4 Turbo accessible for your account type. I recommend upgrading to a paid subscription, you should then be able to access the model in supported regions.
I hope you understand. And, if you have any further query do let us know.
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