Amazon Ad Tag adds an aatSession cookie to North American advertiser websites in November 2026, on by default for 30 days
Amazon Ad Tag now sets a 30-day first-party cookie, aatSession, on North American brand sites by default (Nov 2026). What it tracks and how to opt out.
- Amazon Ad Tag now sets a 30-day first-party aatSession cookie on North American advertiser sites by default, per a release note dated November 16, 2026.
- Opting out takes one command on every page or a checkbox in Amazon's GTM template v4.1; events keep flowing either way.
- Update your cookie list, test consent declines, annotate reports, and check the Safari gap after 30 days.