Veeam connecting to guest os via vix error cannot upload

[aacable]

Scenario:

• Veeam: Version 9.5.0.1536 installed on Windows 2012 R2 (Vm guest, part of Domain)
  Vcenter: 6.5 (VM Guest, part of Domain)
  Multiple ESXI 6.5 servers under VC

I am using Domain Controller Administrator account, & getting Error when testing job under "Guest Processing" (although I can access all server's admin share from the Veeam server like \\target_server\C$ etc)

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veeam connecting to guest os via vix error cannot upload file to admin share 

The error is showing for different vm guests example windows 7 , windows 2008, windows 2012.
So far I have tried following,

• Tried restarting Vcenter
  Tried disabling UAC (via UAC gui and Registry)
  Added LocalAccountTokenFilterPolicy in registry for 2012 as well,
  Firewall is disabled on all machines by group policy

But still getting errors in test window,

[foggy]

Hi Syed, do you see any issues during the actual backup? Credentials test performs two checks - over network (RPC) and over VIX, you can see that the first one is successful, which is sufficient for successful backup.

[aacable]

Getting this error on most vm's

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Error: The remote server returned an error: (503) Server Unavailable.

[foggy]

For the same VMs that fail the VIX test but are successful over RPC connection?