Instance Synchronization tool error while Configure Instance in different Data Center

Hi,

My scenario - want to sync instances from 'ace-d4' company to 'sfpart-dc8' for this I did the following steps but I got error message, please help.

1. logged into 'ace' company provisioning, navigated to Instance Synchronization Company Permissions > Configure Instance in different Data Center
2. Target company configuration section (reference s1)
   • my 'ace' company ID auto populated in 'Target Company ID'
   • entered Target Data Admin's User ID: 'admin'
   • selected DC - DC4 salesdemo4
3. Source Company Configuration section (reference s1 screen)
   • entered 'sfpat' company ID
   • entered Target Data Admin's User ID: 'admin'
   • selected DC - DC8 pmsalesdemo8
4. click on save button, I got the error message (reference s2 screen)
5. in both instances permissions are already granted to user - admin

s1.

s2.

Q1. my scenario, source - ace company and target - sfpart, but as per above screen I see reverse?

Q2. please help me on the above issue

Regards,

Seshu