certificate mismatch on server 2012 RDS

I have used this guide

to set up a high availability server. All has gone well and its working fine. It is installed on local servers.

I am now attempting to set up something similar in Azure. I have used the same document as a guide but I have not set it up as high availability server and I have set up the whole thing on one server.

It is working but I am getting a certificate mismatch warning when connecting to the rdp session via the RDweb interface. The error appears at the final stage where the RDP session loads up.

I can still get to the session but wondered why the mismatch is happening and how I can stop in happening. I dont think this is anything to do with it being hosted in Azure.
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roy_battyDirectorAsked:
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David Johnson, CD, MVPOwnerCommented:
you can always open the certificate when you get the certificate error and examine it.
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roy_battyDirectorAuthor Commented:
Well the FQDN on the certificate is my external  hostname and does not match the internal hostname of the server.

But on my first onsite attempt I created a new DNS zone containing the alternate external FQDN for the server and therefore I didn't get the error. I have done the same this time but foot some reason it is still setting the actual real hostname of the server
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David Johnson, CD, MVPOwnerCommented:
add subject alternative name of the actual real hostname to the certificate
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roy_battyDirectorAuthor Commented:
The host name on the certificate is host.domain.co.uk and the server host name is host.differentdomain.local

Is it possible to use a subject alternative name in this case?
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Windows Server 2012

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