Publish Test Results tasks in Azure DevOps using NUnit

I'm trying to add a 'Publish Test Results' task into my Azure DevOps release pipeline, however, it looks like when I try to publish the .trx file, it's not looking in the correct folder and tries to parse an invalid file format (I'm assuming this is because it can't find the TestResults folder). I can see my file being created here in the Visual Studio Test task logs:

2020-02-19T21:28:57.6557476Z Vstest.console.exe exited with code 0.

2020-02-19T21:28:57.6557819Z:Completed test execution

2020-02-19T21:28:57.6640479Z Test results files: C:\agents\vm1-1_work_temp\TestResults\vm1$_vm1_2020-02-19_21_28_31.trx

However, in my Publish Test Results task logs, I get this error:

2020-02-19T21:28:59.7249456Z [command]C:\agents\vm1-1_work_tasks\PublishTestResults_0b0f01ed-7dde-43ff-9cbb-e48954daf9b1\2.164.3\modules\TestResultsPublisher.exe @C:\agents\vm1-1_work_temp\d793cb80-535e-11ea-9ab4-8f1d738f183d.txt

2020-02-19T21:29:00.5600855Z ##[warning]Failed to parse result files: Invalid file format.

This is what my Test Run and Publish Test Results tasks look like....can anyone point out what I am doing wrong here? I've seen people say that I don't need to add this task, but I am unable to see the Test Results tab in the pipeline, I can only see the .trx file attached to the task (see below).

TestResultsFormat is an alias for the testRunner input name. It seems you are using VSTest testRunner, so in Publish Test Results task, you should choose VSTest in TestResultsFormat.