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Hi. i'm trying to create AWS RDS Multi AZ cluster, got this error, i have tryied the availabilityZones with null or [ ap-southeast-1a,  ap-southeast-1b,  ap-southeast-1c] , my region is ap-southeast-1
```InvalidParameterCombination: Can't create a Multi-AZ DB cluster because there aren't enough Availability Zones (AZs).```

<@U0301JURNUF> ap-southeast-1 only has two AZs

image.png

Maybe it's a new AZ? I can see it in the UI too, but not in any AWS docs.

I can't find a press release about it. I have found a reddit saying people have seen it in the UI since 2018. And it is appearing in `aws ec2 describe-availability-zones` and in the EC2 dashboard service health pane. Looks like it's real!