Gemini API Returns 403 or User Location Is Not Supported: Three Causes, Three Fixes
Google AI Studio has a counter-intuitive property: being able to load the page tells you nothing about whether the API will work. Account country, request-time IP, and billing region fail in three different ways and need three different fixes.
Why loading the page misleads you
The marketing site, the docs, and often the console itself are served globally. API eligibility is evaluated separately, against different signals. So the everyday inference — I can see it, therefore I can use it — is exactly backwards here. Treat page access as no evidence at all and go straight to the three checks.
Cause one: account country
Google accounts carry a region that governs product eligibility, and it is not simply where you are right now. If key creation itself is refused, this is where to look first. Note that this is an account-level property — no per-session workaround changes it, and attempting to appear otherwise tends to create account-standing problems that are worse than the original blocker.
Cause two: the egress IP at request time
This one produces the most confusion because it is environment-dependent. The same key can work from your laptop and fail from CI, a container, or a cloud function — because the request leaves from somewhere else. Before changing anything, confirm the actual egress: make a call to any IP-echo service from the exact environment that is failing. People routinely spend a day on the wrong theory because they assumed the server was where they are.
Cause three: billing region
The distinguishing symptom is that everything works on the free tier and breaks the moment you try to pay. Billing carries its own country and address, evaluated separately from account eligibility. Both need to be in a supported region, and a mismatch between the billing address and the payment instrument adds a second failure mode on top.
The shortest path if you just need Gemini calls working
If your goal is working Gemini calls rather than owning a Google billing relationship, an OpenAI-compatible gateway removes all three variables at once — you change base_url, keep the model name, and the region question stops being yours. That is a real tradeoff, not a free win: you gain a working call today and you take on the job of verifying the provider. If you go that way, run the model-authenticity check first.
Symptom to cause
| Symptom | Cause | Fix |
|---|---|---|
| Cannot create an API key; page loads fine | Account country | The account region governs eligibility — the browser session does not override it |
| Key works locally, 403 from your server | Egress IP at request time | Check where the request actually leaves from; hosted environments often differ from your laptop |
| Free tier fine, paid upgrade blocked | Billing region | A separate profile from the account country; both must be eligible |