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I've seen some similar issues with other SAP and Oracle data sources when the "Run As" user that Tableau Server runs under does not have permissions on the folders in which the driver and/or config details are stored.
This is a bit of a shot in the dark, but I'd take a look at that.
You may also want to attempt "embedding" credentials when you publish the report to see if that makes a difference. I'm not a support guy, but I found an old case where that helped someone with a similar error message. Details on how to embed credentials here:
Greatly appreciate your response. I apologize for the delayed response, was working on some other higher priority items and couldn't work on this. Let me check on this and get back to you.