DKIM - correct Domain GUID for domain with dash\hypen

Per guide: https://blogs.technet.microsoft.com/fasttracktips/2016/07/16/spf-dkim-dmarc-and-exchange-online/

what is the correct GUID for domain conto-so.com.ph ?

contoso-com-ph0i or conto-so-com-ph

generated MX record is contoso.com.ph0i.mail.protection.outlook.com

tnx