Due to various technical limitations, the first iteration of the customer-owned domains functionality will not be available for a few more months. We will provide an update as soon as we can get a more specific ETA.
Fully customizable domains (e.g. any_subdomain. any_domain.com) are not widely available. It is goal to eventually provide this flexibility for all tenants who need it.
However, developers can now use "your-tenant-name".b2clogin.com" for all end user redirects to Azure AD B2C so as to eliminate all references to Microsoft from your redirect URL.
For example, if your b2c tenant name today is your-tenant-name.onmicrosoft.com with GUID; aZZZZZZZ-YYYY-HHHH-GGGG-abcdef569123
The new recommended URL for your B2C tenant is:
For more details: