My default domain on Azure Active Directory was created with my ISP name plus some random number plus sufix onmicrosoft.com (e.g.: my_isp876.onmicrosoft.com).
1 - What is the criteria to automatically give a name domain and identity issuer when we create an azure account?
2 - I added a custom domain, so how can I associated my user, the default user of Azure, with identity issuer of this custom domain for allow me delete domain created automatically?
3 - If it is impossible to do what was asked on item two, how can I fix that without lose trial subscription?
fix that means: To have one main tenant with domain name of my choice (could be onmicrosoft.com oe one of my personal domain).
