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Domain Name With Underscore. The labels must follow the rules for ARPANET host names. Then select Custom domain names Add custom domain.
Underscore As A Valid Domain Name Server Let S Encrypt Community Support from community.letsencrypt.org
The important thing to know is that. Search for and select Azure Active Directory from any page. Below the top level are a few second-level domains apple darwin and zeroconf.
Avoid the use of underscores _ in domain names.
Add your custom domain name to Azure AD. Hyphens are allowed in domain names themselves as well as subdomains and subfolders. The same type of issues would apply however this isnt even an option - underscores cant be used in domains anyway as the character is not permitted. As such you cannot register a domain name with an underscore character.
