diff --git a/eng/pipelines/build-all-lib.yml b/eng/pipelines/build-all-lib.yml
index 7405ab6df3..d170d8c917 100644
--- a/eng/pipelines/build-all-lib.yml
+++ b/eng/pipelines/build-all-lib.yml
@@ -180,6 +180,14 @@ extends:
             projects: ${{ parameters.Projects }}
             arguments: '--configuration Release /p:ContinuousIntegrationBuild=true /p:DebugType=portable /p:DebugSymbols=true'
 
+        # Stage shipping binaries for symbol upload BEFORE the test step;
+        # see publish-symbols-stage.yml for why this must run pre-test.
+        # Pipeline only triggers on v* tags, but condition is explicit so
+        # a manual queue against a branch does not unintentionally upload.
+        - template: /eng/pipelines/publish-symbols-stage.yml@self
+          parameters:
+            condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/tags/v'))
+
         # Test and generate Code Coverage
         - task: DotNetCoreCLI@2
           condition: eq(variables['ShouldTest'], 'true')
@@ -215,6 +223,10 @@ extends:
             SearchPattern: '**/bin/**/*.pdb' # string. Required. Search pattern. Default: **/bin/**/*.pdb.
             SymbolServerType: 'TeamServices'
 
+        - template: /eng/pipelines/publish-symbols-upload.yml@self
+          parameters:
+            condition: and(succeeded(), startsWith(variables['Build.SourceBranch'], 'refs/tags/v'))
+
         # Since NuGet packages are generated during the build, we need to copy them to the artifacts folder.
         - task: CopyFiles@2
           displayName: 'Pack $(Build.BuildNumber)'
diff --git a/eng/pipelines/build-core-lib.yml b/eng/pipelines/build-core-lib.yml
index d443896bc1..f56a7fe6b3 100644
--- a/eng/pipelines/build-core-lib.yml
+++ b/eng/pipelines/build-core-lib.yml
@@ -211,6 +211,12 @@ extends:
             #arguments: '--configuration Release /p:ContinuousIntegrationBuild=true -warnaserror' temp remove warnaserror
             arguments: '--configuration Release /p:ContinuousIntegrationBuild=true'
 
+        # Stage shipping binaries for symbol upload BEFORE the test step;
+        # see publish-symbols-stage.yml for why this must run pre-test.
+        - template: /eng/pipelines/publish-symbols-stage.yml@self
+          parameters:
+            condition: and(succeeded(), or(in(variables['Build.SourceBranch'], 'refs/heads/main', 'refs/heads/dev', 'refs/heads/dev-v5'), startsWith(variables['Build.SourceBranch'], 'refs/heads/archives/')))
+
         # Test and generate Code Coverage
         - task: DotNetCoreCLI@2
           condition: eq(variables['ShouldTest'], 'true')
@@ -239,6 +245,10 @@ extends:
             summaryFileLocation: '**/*.cobertura.xml'
             reportDirectory: CoverageFolder
 
+        - template: /eng/pipelines/publish-symbols-upload.yml@self
+          parameters:
+            condition: and(succeeded(), or(in(variables['Build.SourceBranch'], 'refs/heads/main', 'refs/heads/dev', 'refs/heads/dev-v5'), startsWith(variables['Build.SourceBranch'], 'refs/heads/archives/')))
+
         # Index sources and publish symbols
         - task: PublishSymbols@2
           displayName: 'Publish Symbols to Artifact Services'
diff --git a/eng/pipelines/publish-symbols-stage.yml b/eng/pipelines/publish-symbols-stage.yml
new file mode 100644
index 0000000000..16400d2c86
--- /dev/null
+++ b/eng/pipelines/publish-symbols-stage.yml
@@ -0,0 +1,30 @@
+# Stage shipping binaries for symbol upload. Place this immediately after
+# the Build step, BEFORE any task that runs `dotnet test` with a different
+# /p:DebugType. The test step passes /p:DebugType=Full as a global MSBuild
+# property, which propagates through P2P refs and rebuilds Core with a
+# different MVID; if we staged after the test step, the binaries we upload
+# would not match the binaries inside the shipping nupkg.
+#
+# The .pdb pattern is included for pipelines that build with
+# /p:DebugType=portable (standalone PDBs). For pipelines using the csproj
+# default of <DebugType>embedded</DebugType>, the PDB rides inside the DLL
+# and the .pdb pattern matches nothing — harmless. We deliberately stay on
+# SymWeb only (see publish-symbols-upload.yml's SubmitToInternet:false),
+# so embedded-in-DLL is fine here.
+parameters:
+- name: condition
+  type: string
+
+steps:
+- task: CopyFiles@2
+  displayName: 'Collect shipping binaries for symbol upload'
+  condition: ${{ parameters.condition }}
+  inputs:
+    SourceFolder: '$(Build.SourcesDirectory)'
+    Contents: |
+      src/**/bin/Release/**/Microsoft.FluentUI.*.dll
+      src/**/bin/Release/**/Microsoft.FluentUI.*.pdb
+      !src/Templates/**
+    TargetFolder: '$(Build.ArtifactStagingDirectory)/Symbols'
+    CleanTargetFolder: true
+    flattenFolders: false
diff --git a/eng/pipelines/publish-symbols-upload.yml b/eng/pipelines/publish-symbols-upload.yml
new file mode 100644
index 0000000000..b14f293e6e
--- /dev/null
+++ b/eng/pipelines/publish-symbols-upload.yml
@@ -0,0 +1,27 @@
+# Upload the staged DLL (+ PDB, if standalone) pairs to the internal
+# symbol server. SubmitToInternet:false keeps these out of the public
+# symbol server (MSDL); the task will print a warning about that override
+# which is intentional and safe to ignore. The counterpart to this template
+# is publish-symbols-stage.yml, which must run earlier in the same job.
+parameters:
+- name: condition
+  type: string
+
+steps:
+- task: MicroBuildArchiveSymbols@6
+  displayName: 'Archive symbols to internal symbol server'
+  condition: ${{ parameters.condition }}
+  inputs:
+    azureSubscription: 'VSEng-SymbolsUpload'
+    SymbolsFeatureName: 'FluentUIBlazor'
+    SymbolsProject: 'DDE'
+    SymbolsAgentPath: '$(Build.ArtifactStagingDirectory)/Symbols'
+    # FluentUI is a public Blazor library; we publish to SymWeb for
+    # internal debugging but intentionally skip MSDL because we do not
+    # currently publish symbols there for our packages. The task warns
+    # when SubmitToInternet is overridden — SuppressSymwebOnlyWarning
+    # acknowledges the override is deliberate.
+    SubmitToInternet: false
+    SuppressSymwebOnlyWarning: true
+  env:
+    SYSTEM_ACCESSTOKEN: $(System.AccessToken)