Wei Zhang's Arithmetic Fundamental Lemma for unitary group elements

Let $S(E_0)$ be the relevant symmetric space, let $U(J_1)$ be the unitary group attached to the odd hermitian form, and let $Ω(γ)$, $\partial O_γ(1_{S(\mathcal{O}_{E_0})})$, and $\mathrm{Int}(g)$ denote the transfer factor, the derivative of the orbital integral, and the intersection number. Let $γ\in S(E_0)_{\mathrm{rs}}$ be regular semi-simple and matching an element $g\in U(J_1)$. Assume either $E_0=\mathbb{Q}_p$ or that $g$ is artinian. Arithmetic Fundamental Lemma. Then

$$Ω(γ)\partial O_γ(1_{S(\mathcal{O}_{E_0})})=-\mathrm{Int}(g)\log(q).$$

This is the group version of the Arithmetic Fundamental Lemma attributed to Wei Zhang. The surrounding discussion explains that the orbital integral itself vanishes on the nonsplit unitary side; no general resolution is stated in the source.