1. Have a custom domain registered with a registrar
2. Add a custom domain in [[202404011327 Entra ID|Entra ID]]
3. Create a custom record with the registrar
   1. Entra only supports MX or TXT records
   2. Also useful for [[202407271215 Create Azure DNS zone and records|Create Azure DNS zone and records]]/[[202404141450 Azure DNS|Azure DNS]]
4. After the above is done, come back to [[202404011327 Entra ID|Entra ID]] and verify

references:

Add custom Domain