Below is what I got in logs.

Octokit.AuthorizationException: Must authenticate to access this API.
at Octokit.Connection.HandleErrors(IResponse response)
at Octokit.Connection.d__58.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Octokit.Connection.d__571.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Octokit.ApiConnection.<Put>d__261.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at GitHub.Api.LoginManager.d__18.MoveNext() in D:\a\VisualStudio\VisualStudio\src\GitHub.Api\LoginManager.cs:line 220
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at GitHub.Api.LoginManager.d__13.MoveNext() in D:\a\VisualStudio\VisualStudio\src\GitHub.Api\LoginManager.cs:line 102
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at GitHub.Api.LoginManager.d__13.MoveNext() in D:\a\VisualStudio\VisualStudio\src\GitHub.Api\LoginManager.cs:line 125
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at GitHub.VisualStudio.ConnectionManager.d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at GitHub.ViewModels.Dialog.LoginTabViewModel.d__55.MoveNext() in D:\a\VisualStudio\VisualStudio\src\GitHub.App\ViewModels\Dialog\LoginTabViewModel.cs:line 159
{"message":"Must authenticate to access this API.","documentation_url":"https://developer.github.com/enterprise/2.19/v3"}