"TFS.WebApi.Exception: 401: error" exception dialog on export

[ghost]

Installed product versions

• Export/Import Buid Definition extension: 0.0.2

Description

Export fails immediately with exception dialog being shown: TFS.WebApi.Exception: 401: error

Steps to recreate

1. Call export from the context menu
2. Error dialog appears

[RedNeckRedCoat]

Getting the same error for an On premise TFS 2017 installation..

Unable to parse the uploaded JSON due to error TFS.WebApi.Exception: TF400813: Resource not available for anonymous access. Client authentication required.

looking at the logs we see.
scripts=VSS%2FAuthentication%2FContracts%3B*RestClient&v=Dev15.M105.5&json fail with a 401
and cs-username is blank.