Microsoft365DomainAvailable

Availability of a .onmicrosoft.com domain for a new Microsoft 365 tenant

domain_prefixstringrequired

Requested tenant domain prefix

microsoft_domainstringrequired

Full ".onmicrosoft.com" domain

availablebooleanrequired

Whether the domain is available for a new tenant: false if a tenant already has it at Microsoft

Microsoft365DomainAvailable

{
  "domain_prefix": "string",
  "microsoft_domain": "string",
  "available": true
}