Performance Max campaigns auto-migrated to brand guidelines from May 1, 2025 (API accounts from June 1)

Google began automatically enabling brand guidelines on Performance Max campaigns using consistent business name and logo assets across asset groups; UI-managed accounts from May 1, 2025, API users from June 1, 2025. Brand assets move from AssetGroupAsset to campaign-level CampaignAsset, so integrations must check Campaign.brand_guidelines_enabled.

The July 14, 2025 follow-up confirmed brand guidelines are enabled by default for new UI-created PMax campaigns, and that from v21 brand guidelines are enabled by default for API-created campaigns (opt out with Campaign.brand_guidelines_enabled = false on creation). CampaignService.EnablePMaxBrandGuidelines (max 10 operations per request) migrates existing campaigns manually; the automatic migration was expected to finish by October 30, 2025.