TFS connection to SharePoint failed, user does not exist

First the problem: From TFS when running the SharePoint-repair-connection-program i get for some of my TFS-projects (not all??):

Connecting project portal site at http://svm-sp2010/WEBSITE/ (1 of 20)
Connection failed for project portal site at http://svm-sp2010/WEBSITE/: Server was unable to process request. ---> The user does not exist or is not unique. ---> The user does not exist or is not unique.


We have upgraded from a single server solution TFS 2008, SQL 2005, WSS 3.0 to three seperate servers for TFS 2010, SharePoint 2010 and SQL 2008.

I installed, configured and upgraded the TFS and SQL, but I hired some indian guys to upgrade the SharePoint solution. Now I am not sure they did everything correct.
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hke72Asked:
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bradgcozaCommented:
Try add the user to SharePoint manually.

stsadm -o adduser -url http://swm-sp2010 -userlogin username -useremail username@email.com -username username

Or check to see in central admin if you have site collection rights on the site http://swm-sp2010
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Justin SmithSr. System EngineerCommented:
TFS doesn't work with 2010 web apps that use Claims based authentication.  
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hke72Author Commented:
So when this is our reality:

We already have a working SharePoint-Claims based server with project documents and user-rights.

What should we do?
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Justin SmithSr. System EngineerCommented:
Use classic authentication, or wait for Microsoft to put out a fix. Only options really.
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hke72Author Commented:
But it is not possible to change from Claims to Classic! Is it?
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Justin SmithSr. System EngineerCommented:
i don't believe so. You could migrate to a classic web app.
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hke72Author Commented:
What about this:
Classic to claims
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hke72Author Commented:
I had some guy help me with this and he found there was something wrong with the rights of the folders in SharePoint. Anyway - he fixed it and I am happy.

The solution for the projects where it did not work was to create them again in the right place where the serviceuser can access them. - if that helps someone?
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hke72Author Commented:
I had help from someone fixing this!
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