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Asked: 2026-05-26T06:07:47+00:00

TF255356: The following error occurred when configuring the Team Foundation databases: Error occurred while

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TF255356: The following error occurred when configuring the Team
Foundation databases: Error occurred while validating servicing step
Add Running User to the TFSADMINROLE for component Install during
Install: Unable to deserialize servicing step data to type
Microsoft.TeamFoundation.Server.Servicing.TFCollection.AddSqlRoleMemberStepData..
For more information, see the configuration log.

Error occurred while validating servicing step Add Running User to the
TFSADMINROLE for component Install during Install: Unable to
deserialize servicing step data to type
Microsoft.TeamFoundation.Server.Servicing.TFCollection.AddSqlRoleMemberStepData.

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1 Answer

  1. Editorial Team

    This is a known problem registered in Microsoft Connect:

    When I use domain\user and the domain has ‘&’ in it, this error
    occurs. I don’t know what to do anymore.

    Error TF255356: The following error occurred when configuring the
    Team Foundation databases: Error occurred while validating servicing
    step Add Service Account to Application TFSEXECROLE for component
    Install during Install: Unable to deserialize servicing step data to
    type
    Microsoft.TeamFoundation.Server.Servicing.TFCollection.AddSqlRoleMemberStepData..
    For more information, see the configuration log.

    So my guess is that somewhere in your domain, group, service or user name used during installation and configuration of TFS, there is a symbol included that cannot be deserialized correctly. Thinking about symbols like < > & %.

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