8 May 2025 · GTM · info severity · fix verified 9 Sept 2026
First-party mode is now Google tag gateway for advertisers
'Google tag gateway for advertisers (previously first-party mode) is now available for everyone, unlocking support for both client side and server-side tags.'
What it breaks
Nothing breaks; docs and settings that say 'first-party mode' refer to this.
Who it hits: Anyone following a 2024 first-party-mode guide.
The fix
Read 'first-party mode' as 'Google tag gateway' in older guides.
No artifact for this entry — the note above is the whole fix.
Sources linked on every entry · artifacts stamped and re-verified · ← all changes