Unable to create Aurora (PostgreSQL Compatible) with Data API in Mumbai (ap-south-1) for Aurora PostgreSQL 13 (13.9)

Hello.

I also confirmed that Aurora Serverless v1 is no longer selectable from my management console.
So, why not try starting it from the AWS CLI?
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/aurora-serverless.create.html

aws rds create-db-cluster --db-cluster-identifier sample-cluster \
    --engine aurora-postgresql --engine-version 13.9 \
    --engine-mode serverless \
    --scaling-configuration MinCapacity=8,MaxCapacity=64,SecondsUntilAutoPause=1000,AutoPause=true \
     --master-username username --master-user-password Dtabase-Password

Although it is probably not supported in the Mumbai region yet, Aurora Serverless v2 now supports DataAPI, so I think it would be a good idea to use Aurora Serverless v2 in the future.
https://aws.amazon.com/about-aws/whats-new/2023/12/amazon-aurora-postgresql-rds-data-api/?nc1=h_ls