Microsoft Monetize adds Copilot deal troubleshooting, richer OpenRTB buyer signals and confirms AppNexus Prebid adapter shutdown in early 2027

Microsoft Advertising published on October 21, 2026 a set of updates for Microsoft Monetize, its publisher monetization platform. New Copilot capabilities include a Deal Troubleshooting Agent and data visualizations that turn reporting results into charts. On the buy side, Monetize now passes OpenRTB 2.6 dynamic ad pod signals to DSPs starting with The Trade Desk, streamlines non-guaranteed deal activation with The Trade Desk via an updated deal-sync connection, applies Amazon's Dynamic Traffic Engine traffic-shaping recommendations, and released seven OpenRTB signal updates this quarter to give DSPs richer, more standardised information. Microsoft also reminds publishers that the legacy AppNexus adapter will be shut down in early 2027, including removal from Prebid.js, and that they should upgrade to the Microsoft Prebid Adapter.

Impact

For publishers on Microsoft Monetize, the AppNexus adapter shutdown is an action item: header bidding setups still using the legacy adapter risk losing demand from early 2027. For agencies and trading desks buying through The Trade Desk or Amazon DSP, richer OpenRTB signals and ad pod data can improve CTV and deal targeting on Monetize supply, and faster deal activation can shorten setup time for private marketplace campaigns.

Recommendations

Publishers should confirm their Prebid.js configuration uses the Microsoft Prebid Adapter rather than the legacy AppNexus adapter before early 2027
Programmatic buyers should check with their DSP which new OpenRTB and ad pod signals from Monetize supply are available for targeting
Use the streamlined deal-sync with The Trade Desk to reduce manual deal setup for holiday PMP campaigns

Source: Microsoft Advertising Blog