Any suggestion on why I'm getting this error while creating scratch org today ?

Scratch Org Definition

{
   "orgName":"OrgName",
   "edition":"Developer",
   "features":[
      "AuthorApex",
      "Communities",
      "EnableSetPasswordInApi",
      "FieldAuditTrail",
      "StateAndCountryPicklist"
   ],
   "settings":{
      "accountSettings":{
         "enableAccountHistoryTracking":true,
         "enableContactHistoryTracking":true
      },
      "communitiesSettings":{
         "enableNetworksEnabled":true
      },
      "currencySettings":{
         "enableMultiCurrency":true
      },
      "opportunitySettings":{
         "enableOpportunityFieldHistoryTracking":true
      },
      "languageSettings":{
         "enableTranslationWorkbench":true,
         "enableEndUserLanguages":true
      },
      "lightningExperienceSettings":{
         "enableS1DesktopEnabled":true
      },
      "securitySettings":{
         "enableAdminLoginAsAnyUser":true
      },
      "sharingSettings":{
         "enableExternalSharingModel":true
      },
      "liveAgentSettings":{
         "enableLiveAgent":true
      },
      "apexSettings":{
         "enableApexApprovalLockUnlock":true
      }
   },
   "objectSettings":{
      "case":{
         "sharingModel":"private"
      },
      "opportunity":{
         "sharingModel":"read"
      }
   }
}

Error Message

{
  "code": 1,
  "actions": [
    "See https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_scratch_orgs_error_codes.htm for information on error code C-9999."
  ],
  "context": "EnvCreateScratch",
  "commandName": "EnvCreateScratch",
  "data": {
    "username": "*******",
    "orgId": "00D90000000XXXXXXX",
    "scratchOrgInfoId": "2SR7T000000XXXXXXX"
  },
  "message": "A fatal signup error occurred. Please try again. If you still see this error, contact Salesforce Support for assistance",
  "name": "RemoteOrgSignupFailed",
  "status": 1,
  "stack": "RemoteOrgSignupFailed: A fatal signup error occurred. Please try again. If you still see this error, contact Salesforce Support for assistance\n
...
  "exitCode": 1,
  "warnings": [
    "Record types defined in the scratch org definition file will stop being capitalized by default in a future release.\nSet the `org-capitalize-record-types` config var to `true` to enforce capitalization."
  ]
}