Use Envvar

.azure/pipelines/helix-test.yml

@@ -14,14 +14,11 @@ jobs:
     jobDisplayName: 'Tests: Helix'
     agentOs: Windows
     timeoutInMinutes: 240
-    variables:
-      HelixBuildCounter: $[pipeline.startTime]
     steps:
     - script: .\build.cmd -all -ci /p:BuildNative=true /t:Helix /p:IsHelixJob=true /bl:$env:BUILD_SOURCESDIRECTORY\artifacts\log\SendToHelix.binlog
       displayName: Run build.cmd helix target
       env:
         SYSTEM_ACCESSTOKEN: $(System.AccessToken) # We need to set this env var to publish helix results to Azure Dev Ops
-        HELIX_BUILD_COUNTER: $(HelixBuildCounter)
     artifacts:
     - name: Helix_logs
       path: artifacts/log/

eng/helix/helix.proj

@@ -19,7 +19,7 @@
   <PropertyGroup Condition=" '$(CI)' == 'true' ">
     <HelixType>ci</HelixType>
     <Creator>aspnetcore</Creator>
-    <HelixBuild>$(BUILD_BUILDNUMBER).$(HELIX_BUILD_COUNTER)</HelixBuild>
+    <HelixBuild>$(BUILD_BUILDNUMBER).$(SYSTEM_JOBATTEMPT)</HelixBuild>
     <WaitForWorkItemCompletion>true</WaitForWorkItemCompletion>
     <EnableAzurePipelinesReporter>true</EnableAzurePipelinesReporter>
     <FailOnMissionControlTestFailure>true</FailOnMissionControlTestFailure>