Azure VM DNS Namespacing Question

Hi all. In the process of getting our AWS machines up in Azure, and running into a simple but annoying issue wrt DNS names for our instances.
Understanding that the DNS entry must be globally unique, we're trying to use a DNS name along the lines of:
COMPANY-ENVIRONMENT-MACHINETYPE-NUMBER.cloudapp.net.
A real world example would be:
fiftymission-prod-app-1.cloudapp.net
We are of cource running into the Azure DNS name limitation of 3-15 characters, meaning we're going to have to choose a more cryptic name like:
fifty-p-a-1.cloudapp.net.
Before we go ahead and provision everything, just looking to confirm that 15 chars is the limit and if anyone has any namespacing tricks to ensure consistency and uniqueness.
Cheers

Hi,
Based on my experience, the DNS name of the cloud service must be globally unique. When you create a cloud service, the DNS name(except for the “.cloudapp.net”) contains only letters, numbers, hyphens and the first and last character in the field must be a
letter or number. Trademarks, reserved words, and offensive words are not allowed.
In addition, I tried on my side and the limitation is 63 characters.
Did you want to create each VM in a cloud service? How many VMs did you want to create? Why don’t you create them in the same cloud service? The VMs in the same cloud service share the same public IP address and can be connect between each other via a private
channel.
Best regards,
Susie
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    at Microsoft.IdentityModel.Tokens.Saml11.Saml11SecurityTokenHandler.ValidateToken(SecurityToken token)
    at Microsoft.IdentityModel.Tokens.SecurityTokenHandlerCollection.ValidateToken(SecurityToken token)
    at Microsoft.IdentityModel.Web.TokenReceiver.AuthenticateToken(SecurityToken token, Boolean ensureBearerToken, String endpointUri)
    at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.SignInWithResponseMessage(HttpRequest request)
    at Microsoft.IdentityModel.Web.WSFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs args)
    at Microsoft.SharePoint.IdentityModel.SPFederationAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs eventArgs)
    at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

    I want 100,000 external users to have access to my SharePoint online Site collection.
    I was thinking of going the Azure AD route, where external users will have there ID's created in Azure AD cloud.
    Trying to figure how I can integrate Azure AD cloud with my SharePoint Online Site collection.
    Currently my site collection is tied to On-premise AD.
    Is there a way to integrate the SharePoint online to use both Azure AD and On-premise AD?
    Thanks
    Nate
    Any Answer here?

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