diff --git a/app/src/main/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCase.kt b/app/src/main/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCase.kt
index 7c3d0d58f00..083a94ef64b 100644
--- a/app/src/main/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCase.kt
+++ b/app/src/main/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCase.kt
@@ -78,9 +78,9 @@ class ObserveParticipantsForConversationUseCase @Inject constructor(
 
                 ConversationParticipantsData(
                     admins = visibleAdminsWithoutServices
-                        .map { uiParticipantMapper.toUIParticipant(it.user, mlsVerificationMap[it.user.id].let { false }) },
+                        .map { uiParticipantMapper.toUIParticipant(it.user, mlsVerificationMap[it.user.id] ?: false) },
                     participants = visibleParticipants
-                        .map { uiParticipantMapper.toUIParticipant(it.user, mlsVerificationMap[it.user.id].let { false }) },
+                        .map { uiParticipantMapper.toUIParticipant(it.user, mlsVerificationMap[it.user.id] ?: false) },
                     allAdminsCount = allAdminsWithoutServices.size,
                     allParticipantsCount = allParticipants.size,
                     isSelfAnAdmin = allAdminsWithoutServices.any { it.user is SelfUser },
diff --git a/app/src/test/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCaseTest.kt b/app/src/test/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCaseTest.kt
index 6eb44e1f24e..dc0e39f3f6c 100644
--- a/app/src/test/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCaseTest.kt
+++ b/app/src/test/kotlin/com/wire/android/ui/home/conversations/details/participants/usecase/ObserveParticipantsForConversationUseCaseTest.kt
@@ -75,14 +75,21 @@ class ObserveParticipantsForConversationUseCaseTest {
                 add(MemberDetails(testOtherUser(i).copy(userType = UserType.INTERNAL), Member.Role.Member))
             }
         }
+        val userId1 = UserId(value = "value1", domain = "domain1")
+        val userId2 = UserId(value = "value2", domain = "domain2")
+        val userId3 = UserId(value = "value3", domain = "domain3")
         val (_, useCase) = ObserveParticipantsForConversationUseCaseArrangement()
             .withConversationParticipantsUpdate(members)
+            .withE2EICertificateStatuses(mapOf(userId1 to true, userId2 to false))
             .arrange()
         // When - Then
         useCase(ConversationId("", "")).test {
             val data = awaitItem()
             assert(data.participants.size == members.size)
             assert(data.allParticipantsCount == members.size)
+            assertEquals(true, data.participants.firstOrNull { it.id == userId1 }?.isMLSVerified)
+            assertEquals(false, data.participants.firstOrNull { it.id == userId2 }?.isMLSVerified)
+            assertEquals(false, data.participants.firstOrNull { it.id == userId3 }?.isMLSVerified) // false if null
         }
     }
 
@@ -244,5 +251,9 @@ internal class ObserveParticipantsForConversationUseCaseArrangement {
         return this
     }
 
+    suspend fun withE2EICertificateStatuses(result: Map<UserId, Boolean>) = apply {
+        coEvery { getMembersE2EICertificateStatuses(any(), any()) } answers { result }
+    }
+
     fun arrange() = this to useCase
 }