video1.0<iframe src="https://www.loom.com/embed/142ba25565684967958a694fca0e0628" frameborder="0" width="1592" height="1194" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>11941592Loomhttps://www.loom.com11941592https://cdn.loom.com/sessions/thumbnails/142ba25565684967958a694fca0e0628-de2cff01b1eca853.gif8.883333The Attribution model dropdown on an account where Custom Attribution isn't available yet. Only Standard and Incremental appear — Meta hides the Custom option rather than greying it out, so there's no error message explaining why. Confirm Attribution Passback is enabled and your connection quality shows High, then check again.