var server = new AzureNative.DBforPostgreSQL.Server("server", new AzureNative.DBforPostgreSQL.ServerArgs
{
    AdministratorLogin = "pgadmin",
    AdministratorLoginPassword = "complex-password",
    Sku = new AzureNative.DBforPostgreSQL.Inputs.SkuArgs
    {
        Name = "Standard_B1ms",
        Tier = SkuTier.Burstable,
    },
    ResourceGroupName = resourceGroup.Name,
    Version = "16",
    Location = resourceGroup.Location,
});

error: resource partially created but read failed autorest/azure: Service returned an error. Status=404 Code="ResourceNotFound" Message="The requested resource of type 'Microsoft.DBforPostgreSQL/flexi bleServers' with name 'server9d9408ec' was not found.": Code="InternalServerError" Message="An unexpected error occured while processing the request. I've searched and it looks like something in the underlying libs, really confusing.