On August 17, 2023, we received reports from some clients that their Web SDK Google AMP notices were generating Google-related errors (e.g., 1.2, 3.3 and 2.1.A errors; also 1.1, 2.1.B and 2.2.B errors) . The cause of the errors was traced to the consent string only containing legitimate interest but without consent information being stored. As a result, the number of Limited Ads being displayed increased.
We identified the root cause of the issue being a code update that was released on Aug 15, 2023 10:10am GMT+0100 related to ongoing work to improve the performance of our Web SDK. We reverted the code in order to resolve the issue on Aug 17, 2023 12:14m GMT+0100.
The bug causing the issue was related to a race condition between computing the consent and storing the consent string and sending it to AMP. Any notices collecting new consent during this window of time most likely would have experienced this issue; pre-existing consent that had been given would not have been impacted. Limited Ads were only displayed for users whose consent was collected after Aug 15, 2023 10:10am GMT+0100.