@Tom I understand that you have questions regarding the Azure FQDN i.e., when you create the VM and add a DNS name in the Portal as shown below:

However, you do not see the same name once you login to the Server/VM in Azure. Is this what you are concerned about? Please correct me otherwise.

The FQDN that is provided here is for the Public IP of the VM. Once you login to the server/VM and do a nslookup for the hostname, you will see the hostname of the private IP of the VM.

In this case, what you are seeing(servername.acad.ac.uk) seems like a private DNS name. Can you confirm what DNS server you are using for this VM/Vnet? Usually it shows up in the NSLOOKUP output.

Thank you!

Answer from SaiKishor-MSFT on learn.microsoft.com
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Microsoft Learn
learn.microsoft.com › en-us › answers › questions › 348048 › how-can-i-create-a-cloudapp-domain-in-azure-portal
How can I create a cloudapp domain in Azure portal? - Microsoft Q&A
(example.cloudapp.com) I have done ... generate the third one? Thank you beforehand. ... An Azure platform as a service offer that is used to deploy web and cloud applications....
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Microsoft Learn
learn.microsoft.com › en-us › azure › cloud-services › cloud-services-custom-domain-name-portal
Configure a custom domain name in Cloud Services (classic) | ...
You must also provide the domain or subdomain alias for the CNAME, such as www if you want to create an alias for www.customdomain.com. If you want to create an alias for the root domain, it may be listed as the '@' symbol in your registrar's DNS tools. Then, you must provide a canonical host name, which is your application's cloudapp.net domain in this case.
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Codementor
codementor.io › devops › tutorial › setting-domain-name-in-azure
How to Set Up a Domain Name in Azure Cloud Service | Codementor
You are then required to provide the domain or subdomain alias for the CNAME, like that of www for the creation of an alias for www.customdomainname.com. If you wish to create an alias for the root domain, you can list it as ‘@’ symbol in the registrar’s DNS tools. Then, you are required to add a canonical host name, which will be the application’s cloudapp.net domain.
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Medium
medium.com › beyondlabsey › using-ssl-in-azure-vm-in-cloudapp-azure-com-domains-with-zerossl-a81af3af3416
Using SSL in Azure VM in cloudapp.azure.com domains with ZeroSSL | by Michel Fernandes | BeyondLabs & Innovation | Medium
February 18, 2018 - The VM from Azure, when is setup to use domain names comes with cloudapp domain, which may vary, but essentially is <your server name>.cloudapp.com.
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Top answer
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You can use CNames to link Azure domains to your existing domain. Just créate a CName that point to your Azure DNS Name. Example:

you need vm.company.com to point to your vm called myvm in Azure. créate CNAME vm that point to myvm.location.cloudapp.azure.com

As for the cert, copy it to the vm and import like you normally would.

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A DNS zone is used to host the DNS records for a particular domain. To start hosting your domain in Azure DNS, you need to create a DNS zone for that domain name. Each DNS record for your domain is then created inside this DNS zone. Finally, to publish your DNS zone to the Internet, you need to configure the name servers for the domain.

Each of these steps is described in the following steps:

Step1: First create the Azure Virtual Machines.

Step2: To get DNS addresses, you need create DNS zones with your domain name.

Go to Azure Portal => New => search DNS zones => Create DNS zones

Name= azurewala.com, Subscription, Resource Group, and Location

Step3: Once Azure DNS zones created you can see four Name Servers.

Step4: Go to GoDaddy control panel and click on the DNS.

Step5: Change the Nameservers by choose your new nameserver type as: Custom

Note: Copy and paste the Name Servers from Azure DNS to GoDaddy

And make sure you have to remove the extra dot before you save.

Step6: Open Created DNS Zones and add a record set

Name: www Type: A TTL: 1 Hours

IP ADDRESS: 52.176.102.178

Note: Give IP Address of the VM.

You may refer detailed workaround steps here: https://stackoverflow.com/questions/45449401/configuring-a-c‌​ustom-domain-name-fo‌​r-an-azure-vm-and-go‌​daddy/45453110#45453‌​110

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Netify
netify.ai › home › resources › domains › azure.com
azure.com - Domain Info - Microsoft Azure
clarity-ingest-eus2-sc.eastus2.cloudapp.azure.com · and 2,814 more · Notable Hostnames Data The list of notable hostnames comes from not only DNS requests but also HTTP headers, TLS certificates, DNS hinting, and other deep packet inspection methods. Application Stack · Applications · Hostnames · Domains ·
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GitHub
github.com › niteshmmgupta › cloudapp.azure.com-subdomain-takeover
GitHub - niteshmmgupta/cloudapp.azure.com-subdomain-takeover
This repo demonstrates how to takeover subdomain which is pointing to Azure Virtual Machine (cloudapp.azure.com) service. A subdomain takeover vulnerability occurs when a subdomain (e.g., sub.example.com) of a domain points to an external service, and the ownership of that external service is lost by the original domain owner.
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Microsoft Learn
learn.microsoft.com › en-us › azure › app-service › app-service-web-tutorial-custom-domain
Set up an existing custom domain name for your app - Azure App Service | Microsoft Learn
For example, to add DNS entries for contoso.com and www.contoso.com, you must be able to configure the DNS settings for the contoso.com root domain. Your custom domains must be in a public DNS zone; private DNS zones are not supported. If you don't have a custom domain yet, you can purchase an App Service domain instead. In the Azure portal, navigate to your app's management page.
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GitHub
github.com › shibayan › keyvault-acmebot › discussions › 608
Does this work for Azure default domains, specifically, *.cloudapp.azure.com? · shibayan/keyvault-acmebot · Discussion #608
Here's a better one: *.cloudapp.azure.com. That one is possible: the AzureTRE project does it (of course not using your solution but using a custom script). Beta Was this translation helpful? Give feedback. ... There was an error while loading. Please reload this page. Something went wrong. There was an error while loading. Please reload this page. ... I did not know that LE had issued a certificate to this domain.
Author   shibayan
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Namecheap
namecheap.com › support › knowledgebase › article.aspx › 9846 › 2208 › how-to-point-a-domain-to-azure
How to point a domain to Azure - Domains - Namecheap.com
For instance, if your Cloud Service is named "example", your users will be able to access your application on a URL like http://example.cloudapp.net. Azure also assigns a virtual IP address. Thus, it is possible to point your custom domain to Azure either via a CNAME record or an IP address.
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Let's Encrypt
community.letsencrypt.org › help
Hitting Rate Limit for swedencentral.cloudapp.azure.com - Help - Let's Encrypt Community Support
May 6, 2024 - I wanted to generate a certificate ... 2024-05-07T01:00:00Z The Domain Name "swedencentral.cloudapp.azure.com" is part of the public Microsoft-cloud (Azure)....
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Stratus Security
stratussecurity.com › home › uncategorized › microsoft azure subdomain takeover guide
Microsoft Azure Subdomain Takeover Guide
July 22, 2025 - The domains will always point to <dns-name>.<region>.cloudapp.azure.com for this service, in some rare cases you will see it without the region but these are legacy deployments that can’t be taken over.