Joining Windows 10 to Synology Active Directory Domain

[Louisb]

I'm trying to join a domain that resides on my Synology NAS. When trying to join the domain I'm getting the following message:






I've also tried joining the domain using the "Network ID" button and I get the following message:





I'm running Windows 10 Professional, the machine is in the same subnet. I'm able to connect to all resources on the NAS and access the Internet.
I've reloaded Windows 10 and rebooted the machine several times, but continue to get the same results.
What am I doing wrong or could be causing this?

Thanks

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