Bug Report - Belgium Central not accepted by template

[chencaims]

Describe the bug
{ "code": "InvalidTemplate", "message": "Deployment template validation failed: 'The template variable 'policyParameterMapping' is not valid: The language expression property 'belgiumcentral' doesn't exist, available properties are 'australiacentral, australiacentral2, australiaeast, australiasoutheast, brazilsouth, brazilsoutheast, centraluseuap, canadacentral, canadaeast, centralus, eastasia, eastus2euap, eastus, eastus2, francecentral, francesouth, germanynorth, germanywestcentral, centralindia, southindia, westindia, indonesiacentral, israelcentral, italynorth, japaneast, japanwest, jioindiacentral, jioindiawest, koreacentral, koreasouth, mexicocentral, newzealandnorth, northcentralus, northeurope, norwayeast, norwaywest, polandcentral, qatarcentral, southafricanorth, southafricawest, southcentralus, spaincentral, swedencentral, swedensouth, southeastasia, switzerlandnorth, switzerlandwest, uaecentral, uaenorth, uksouth, ukwest, westcentralus, westeurope, westus, westus2, westus3, usdodcentral, usdodeast, usgovarizona, usgoviowa, usgovtexas, usgovvirginia, usnateast, usnatwest, usseceast, ussecwest, chinanorth, chinanorth2, chinanorth3, chinaeast, chinaeast2, chinaeast3, germanycentral, germanynortheast'.. Please see https://aka.ms/arm-functions for usage details.'." }

Steps to reproduce

1. In Network topology and connectivity section, choose Belgium Central as the Region for the first networking hub
2. Click Review + create

Screenshots