1. UET Tag ID
In Microsoft Advertising → Tools → Conversion Tracking → UET tags. The UET Tag ID is 8-9 numeric characters (without "uet_").
2. Fill it in in DataNostro
Dashboard → Platforms → Microsoft Ads — UET Tag ID. Server-side mode uses the Microsoft Bingbat protocol; no access token is needed.
3. Test it
The UET Tag Helper extension in Edge can debug named events. Server-side events appear in the Conversions report → Tag activity within 4 hours.