When did you manage to get that? I tried signing up for the ARM server several times but it always says it's unavailable at the moment in my region (East - Toronto) and I should try a different region... however you can't switch regions after you set up your account. I talked to their support and they said it's unavailable for the foreseeable future... choose a different configuration.
Are people still able to provision those instances in other regions? If so, which one(s)? I'm just using the legacy free one for now, the 2GHz AMD with 0.5GB RAM.
You’d need to upgrade the account to a paid one (there will be no charges anyway if you stay within free limits of the ARM offer), which unlocks a different pool to spin up a server in.
From what I can tell you need to be lucky. When I register my (European) account there are ARM resources left and they were easy to claim. I think I was lucky because they just expanded a data center somewhere nearby, though, I think there was info about it on a Reddit post somewhere.
I don't think the forever-free tier allows cross region instances. You may just need to register an account in another region where they have more resources, but it's anyone's guess where Oracle still has them.
It's a neat playground but as should be blatantly obvious it's not worth investing too much time into, because they can make it disappear without recourse for no reason without warning.
If I lost it, I'd just have to do building locally.