SharePoint 2013 - PowerPivot - The following connections failed to refresh.

Thanks for taking a look. I have tried countless blogs and other forum posts and can't seem to resolve this.
I am working on SP2013 with SQL Server 2012 in a single farm environment. My domain is on another VM.
I am using interactive refresh. (Click Data > Refresh All Connections) from the PP Workbook in SharePoint.
The connection is embedded.
I am getting the error "We were unable to refresh one or more data connections in this workbook. The following connections failed to refresh: (Name of my connection). The connection is using windows authentication
What I have tried:
I have checked ULS Logs, nothing showing up unfortunately.
I checked local system messages on server, nothing there.
I changed both the PowerPivot and Excel Services application pools to run under Domain\Administrator
I changed both the PowerPivot and Excel Services unattended accounts to run under Domain\Administrator
Ran IISReset command from windows powershell.
Restarted SSAS Services
Verified the Server was registered in Excel Services (Data Model Settings)
Verified that data refresh was enabled on the PowerPivot workbook at the site collection level.
In central administration I set the business hours to 6am - 8am for data refresh so this would not be an issue.
I verified that the Secure Store Service is started in central administration
I have also ran SQL Server Profiler and all I see is this error, i'm not even sure it's related. Searching the error hasn't helped:
"The commit or rollback request cannot be completed because there is no active transaction in this session."
I verified that Claims to Windows Token Service is running in central administration.
I've tried editing the workbook connection to use specified accounts as well. When I do that I get the following error:
An error occurred while accessing application id SP2013\Administrator from the Secure Store Service. The following connections failed to refresh: (My connection name).
Any help or direction would be much appreciated. Thanks.

did you try below technet guide?
Unable to refresh data for a data connection in the workbook. Try again or contact your system administrator. The following connections failed to refresh: PowerPivot Data
also check this guy:
http://voices.yahoo.com/powerpivot-error-unable-refresh-data-data-11642048.html?cat=15
Are you using the office web apps?
https://blogs.technet.com/b/excel_services__powerpivot_for_sharepoint_support_blog/archive/2013/01/31/powerpivot-for-sharepoint-browser-refresh-fails-data-refresh-not-supported-in-office-web-apps.aspx
Please remember to mark your question as answered &Vote helpful,if this solves/helps your problem. ****************************************************************************************** Thanks -WS MCITP(SharePoint 2010, 2013) Blog: http://wscheema.com/blog

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Hi Alex,
From your description, I notice that the issue is related to Office client. We would like to help you, but I’m sorry that our forum does not focus on this scenario and has limited resources regarding it. However, we have a dedicated support forum where
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Microsoft Office Community:
Feel free to sign in to the Office community and click to post the question with the relevant information.
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Hello Alex,
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at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
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Checked the Alternative access mapping on the provider server and it looks good.
what would cause this to happne and how can this be resolved
Satyam

Cameron,
Thanks for taking the time to reply.
Actually, it may not be related to compatibility. Let me explain in detail (As below)
Client has 2 different environments SharePoint 2010 and SharePoint 2013.
On SharePoint 2010 they have the web application-Site collections, however for My sites they use SharePoint 2013, where the trust (Root certificate and the STS ) was shared... Making the SP2010
as the consumer and SP 2013 as the provider.
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which still has the look and feel of sharepoint 2010, and under pictures when we choose the button "Choose Picture" we get the error message with the corelation ID, when checked the ULS logs we get the message (Mentioned in the first post and is
also mentioned below)
"Exception Unhandled exception caught during execution of Microsoft.SharePoint.Portal.PageBase::ErrorHandler().
Exception information: Exception information: System.IO.FileNotFoundException: The Web application at http://my-sites/ could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator
may need to add a new request URL mapping to the intended application. "
I have checked the AAM and it looks good.
When the user clicks on my profile on SP2010 environment , the user must be diverted to the sp2013 environment to update his information...correct ?
Satyam..

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SharePoint 2013 - PowerPivot - The following connections failed to refresh.

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