Bad request exception after enabling TFS4JIRA Synchronization

Problem

If you start a Live Synchronization or attempt to use the Initial Migration, without first installing the TFS4JIRA add-on in Jira, you will get the following exception in the Logs:

2020-09-08 22:33:51,782 [10] WARN SpartezSoftware.Synchronizer.Services.Workers.SynchronizationWorker - Error running profile "DEMO" synchronization System.Net.Http.HttpRequestException: Request failed - BadRequest (Bad Request) at SpartezSoftware.Synchronizer.Client.RestClient.<RequestAsync>d__1.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 SpartezSoftware.Synchronizer.Client.RestClient.<Request>d__0.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 SpartezSoftware.Synchronizer.Extensions.TaskExtension.SynchronouslyGetResult[T](Task`1 thisTask) at SpartezSoftware.Synchronizer.Services.JsonService.JsonOp(HttpMethod operation, String url, Object json, HttpStatusCode[] expectedCodes, IAuthentication authentication) at SpartezSoftware.Synchronizer.Services.JsonService.JsonOp(HttpMethod operation, String url, Object json, HttpStatusCode expectedCode, IAuthentication authentication) at SpartezSoftware.Synchronizer.Services.JiraService.CheckLicenseForOnDemandJira(String jiraUrl) at SpartezSoftware.Synchronizer.Services.LicenseService.FetchLicense(SyncProfile syncProfile) at SpartezSoftware.Synchronizer.Services.LicenseService.GetLicense(SyncProfile profile) at SpartezSoftware.Synchronizer.Services.Workers.SynchronizationWorker.<RunSyncProfileAsync>d__15.MoveNext()

This exception indicates that you are missing one of the components that are required to run the synchronization. The add-on in your Jira.

How to resolve

In Jira, navigate to Administration > Apps > Find new Apps and install TFS4JIRA.

Once you have done it, make sure the license is in place and attempt to enable Live Sync or run the Initial Migration once again.