diff --git a/webui/src/api/scheduling.ts b/webui/src/api/scheduling.ts
index 2339dc8..83a30d3 100644
--- a/webui/src/api/scheduling.ts
+++ b/webui/src/api/scheduling.ts
@@ -27,6 +27,7 @@ export type SchedulingCandidateSlot = {
 
 export type SchedulingParticipant = {
   id: string;
+  revision?: string | null;
   is_current_participant: boolean;
   respondent_id?: string | null;
   display_name?: string | null;
@@ -168,6 +169,7 @@ export type SchedulingCandidateSlotReconcilePayload = SchedulingCandidateSlotPay
 
 export type SchedulingParticipantReconcilePayload = SchedulingParticipantPayload & {
   id?: string;
+  revision?: string;
 };
 
 export type SchedulingCandidateSlotUpdatePayload = {
diff --git a/webui/src/features/scheduling/SchedulingPage.tsx b/webui/src/features/scheduling/SchedulingPage.tsx
index e229abc..346dd7a 100644
--- a/webui/src/features/scheduling/SchedulingPage.tsx
+++ b/webui/src/features/scheduling/SchedulingPage.tsx
@@ -1696,7 +1696,9 @@ function notificationKindLabel(kind: string): string {
     invitation: "i18n:govoplan-scheduling.invitation.6306ef74",
     reminder: "i18n:govoplan-scheduling.reminder.b87a1929",
     decision: "i18n:govoplan-scheduling.decision.7f59a1f1",
-    cancellation: "i18n:govoplan-scheduling.cancellation.319aaae4"
+    cancellation: "i18n:govoplan-scheduling.cancellation.319aaae4",
+    participant_removed: "i18n:govoplan-scheduling.participant_removed.0cf4ec4c",
+    participant_replaced: "i18n:govoplan-scheduling.participant_replaced.2623752d"
   } as Record<string, string>)[kind] ?? kind;
 }
 
diff --git a/webui/src/features/scheduling/schedulingViewModel.ts b/webui/src/features/scheduling/schedulingViewModel.ts
index a15e833..e1f032c 100644
--- a/webui/src/features/scheduling/schedulingViewModel.ts
+++ b/webui/src/features/scheduling/schedulingViewModel.ts
@@ -11,6 +11,7 @@ const DIRECTORY_SELECTION_METADATA_KEY = "directory_selection";
 export type SchedulingParticipantDraft = PeoplePickerItem & {
   draftId: string;
   sourceId?: string;
+  revision?: string;
   respondent_id?: string | null;
   display_name: string;
   email: string;
@@ -95,6 +96,7 @@ export function participantDraftFromResponse(
     source_revision: selection?.source_revision ?? null,
     draftId,
     sourceId: participant.id,
+    revision: participant.revision ?? undefined,
     respondent_id: participant.respondent_id,
     participant_type: normalizedParticipantType(participant.participant_type),
     required: participant.required ?? true,
@@ -129,9 +131,11 @@ export function participantDraftsFromPicker(
 
 export function participantPayload(
   participant: SchedulingParticipantDraft
-): SchedulingParticipantPayload & { id?: string } {
+): SchedulingParticipantPayload & { id?: string; revision?: string } {
   return {
-    ...(participant.sourceId ? { id: participant.sourceId } : {}),
+    ...(participant.sourceId
+      ? { id: participant.sourceId, revision: participant.revision }
+      : {}),
     respondent_id: participant.respondent_id ?? null,
     display_name: participant.display_name.trim() || null,
     email: participant.email.trim() || null,
diff --git a/webui/tests/scheduling-view-model.test.ts b/webui/tests/scheduling-view-model.test.ts
index e44c0ea..9e40d4a 100644
--- a/webui/tests/scheduling-view-model.test.ts
+++ b/webui/tests/scheduling-view-model.test.ts
@@ -70,6 +70,7 @@ test("maps visible account and contact selections into bounded scheduling partic
 test("reconstructs saved directory selections and preserves existing reconciliation identity", () => {
   const responseParticipant = {
     id: "stored-participant",
+    revision: "a".repeat(64),
     is_current_participant: false,
     respondent_id: "account-2",
     display_name: "Ada Account",
@@ -95,6 +96,7 @@ test("reconstructs saved directory selections and preserves existing reconciliat
   assert.equal(draft.sourceId, "stored-participant");
   assert.equal(draft.identityLocked, true);
   assert.equal(participantPayload(draft).id, "stored-participant");
+  assert.equal(participantPayload(draft).revision, "a".repeat(64));
 });
 
 const now = new Date("2026-07-20T10:00:00Z");