Windows 10: Joining a Domain

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

:)

 

Re-join the domain after upgrade

There is no need to leave the domain, you can perform the upgrade (with Admin privileges).

You can also leave the domain, upgrade with a local account, then join the domain again.

Resources:

• Quick
  Tip: Join a Windows 10 PC to a Domain

 

Join Windows 10 PC to a Domain  


@rseiler,

I just finished clean installing Windows 10 Enterprise build 17093 in a VM using a local account, and it still has the same steps in the tutorial for me.

Is your PC already joined to a domain?

 

Join Windows 10 PC to a Domain  


I just checked an RS3 PC already domain-joined (the RS3 I was checking earlier was not yet joined to anything), and there are no blue links for it either, strongly suggesting that MS lets you only do one or the other.

What I should try is doing an Azure AD join (any method) and then doing a domain join via the old UI. That may be a loophole.