I have the same issue, after clicking update it closes Teams but never starts automatically and after starting manually it fails the update process everytime with same error.
2024-09-05T15:32:45.669172+01:00 0x000004a0 <INFO> EcsSettings: Full build path /BuildSettings/WebView2Canary/x64/latestVersion
2024-09-05T15:32:45.675172+01:00 0x000004a0 <INFO> EcsFetchCompletion: Ecs settings are already up to date
2024-09-05T15:32:45.693169+01:00 0x000004a0 <INFO> UpdaterMain: Wait for ECS check result:0
2024-09-05T15:32:45.693169+01:00 0x000004a0 <ERR> UpdaterMain: Aborting update - Another running updater process instance detected
2024-09-05T15:32:46.724195+01:00 0x000004a0 <INFO> TelemetryService: Telemetry service stopped