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## Problem The scheduled UI Test Automation pipeline ([Dart/161438](https://microsoft.visualstudio.com/Dart/_build?definitionId=161438)) has been failing daily since 2026-04-30 because PR #41280 (`.NET 10 Upgrade`) updated the main build template (`job-build-project.yml`) for .NET 10 / VS 2026 but the parallel changes were missed in the UI Test Automation templates. Symptoms in recent runs (e.g. build [#20260512.1](https://microsoft.visualstudio.com/Dart/_build/results?buildId=146803928)): ``` error NETSDK1045: The current .NET SDK does not support targeting .NET 10.0. Either target .NET 9.0 or lower, or use a version of the .NET SDK that supports .NET 10.0. ``` …emitted ×179 across every csproj during the *Restore solution-level NuGet packages* step on both `Build UI Tests Only Release_x64` and `…_arm64` jobs. ## Changes This PR mirrors the two pipeline changes that PR #41280 already applied to the main CI templates. **1. Install the .NET 10 SDK on the build agent** - File: `.pipelines/v2/templates/job-build-ui-tests.yml` - Bump the pinned `steps-ensure-dotnet-version.yml` parameter from `version: '9.0'` → `'10.0'`. - Matches `job-build-project.yml`, which already installs the .NET 10 SDK alongside 6.0/8.0. **2. Pin the build agent image to VS 2026 (MSBuild 18)** - File: `.pipelines/v2/templates/pipeline-ui-tests-official-build.yml` - Add `demands: ImageOverride -equals SHINE-VS18-Latest` to the agent pool spec. - The .NET 10 SDK (≥ 10.0.300) requires MSBuild 18, which only ships with VS 2026. Without this demand, the SHINE pool selects a default image with VS 2022 / MSBuild 17 and restore fails with `MSB4236: The SDK 'Microsoft.NET.Sdk' specified could not be found`. - Mirrors the unconditional pattern in `pipeline-ci-build.yml` (lines 56–67), which applies the same demand across both `SHINE-INT-L` and `SHINE-OSS-L` pools. ## Validation Queued pipeline 161438 against this branch: | Build | Commit | Result | | --- | --- | --- | | [`146821554`](https://microsoft.visualstudio.com/Dart/_build/results?buildId=146821554) | `4dd13b9` (SDK fix only) | `NETSDK1045` gone ✅ — exposed VS 2022 / MSBuild 17 mismatch | | [`146825355`](https://microsoft.visualstudio.com/Dart/_build/results?buildId=146825355) | `97cadbb` (SDK + agent demand) | Both errors gone ✅ — agent now `Visual Studio\18\Enterprise\` | After this PR, the pipeline reaches NuGet restore and now hits a separate, **pre-existing** issue from the April 13–29 failure window: `401 Unauthorized` on the `shine-oss/PowerToysPublicDependencies` Artifacts feed for newly-released `Microsoft.NETCore.App.*/8.0.27` packages. That requires feed-admin action (granting the Dart pipeline build identity "save from upstream" on the feed, or pre-seeding those package versions) and is **out of scope for this PR**. --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>