Azure Database for PostgreSQL flexible server: SkuNotAvailable error during deployment — Region and SKU availability issues

Problem description

I am encountering a 'SkuNotAvailable' error when attempting to deploy an Azure Database for PostgreSQL flexible server using an ARM template. The deployment process fails during the creation of a new server, even though the requested SKU appears to be available in the region. Also, a new behavior, has been working fine for months, and this started a few days ago.

Environment

Azure Database for PostgreSQL flexible server, region not specified in detail.

What I've already tried

Everything we could think of.

Current status

I am seeking assistance to understand why the 'SkuNotAvailable' error occurs despite the SKU being listed as available, and how to resolve this issue to successfully deploy the server.