Hi Ravi,
One option is to re-run the K2 Configuration Manager. I think at one stage it will ask you who will the K2 service account be and who be the ADMIN account. Make sure you enter VMMOSS01\administartor for the latter value.
The other way is to make changes to DB directly and it is not recommended.
Now you could assign "Export right" for the above account.
Hope this helps,
Marco
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