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MapToWindows: Failed to map to windows: System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: WTS0003: The caller is not authorized to access the service. (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.UnauthorizedAccessException: WTS0003: The caller is not authorized to access the service.
at Microsoft.IdentityModel.WindowsTokenService.CallerSecurity.CheckCaller(WindowsIdentity callerIdentity)
at Microsoft.IdentityModel.WindowsTokenService.S4UServiceContract.PerformLogon(Func`1 logonOperation, Int32 pid)
at Microsoft.IdentityModel.WindowsTokenService.S4UServiceContract.UpnLogon(String upn, Int32 pid)

 

how can we fix this error?

You will need to supply more context. What was going on at the time? If you are getting this using OOTB features you should open a support ticket.

https://community.nintex.com/t5/Technical-Issues/quot-MapToWindows-Failed-to-map-to-windows-quot-error-appears-in/ta-p/125074

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