diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenter.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenter.kt
index a4a13986e8..16bc39fac8 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenter.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStatePresenter.kt
@@ -105,13 +105,13 @@ class IdentityChangeStatePresenter @Inject constructor(
 
 private fun RoomMember.toIdentityRoomMember() = IdentityRoomMember(
     userId = userId,
-    disambiguatedDisplayName = disambiguatedDisplayName,
+    displayNameOrDefault = displayNameOrDefault,
     avatarData = getAvatarData(AvatarSize.ComposerAlert),
 )
 
 private fun createDefaultRoomMemberForIdentityChange(userId: UserId) = IdentityRoomMember(
     userId = userId,
-    disambiguatedDisplayName = userId.value,
+    displayNameOrDefault = userId.extractedDisplayName,
     avatarData = AvatarData(
         id = userId.value,
         name = null,
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
index fa70bebe6a..2a36c5e23f 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateProvider.kt
@@ -20,8 +20,16 @@ class IdentityChangeStateProvider : PreviewParameterProvider<IdentityChangeState
             anIdentityChangeState(),
             anIdentityChangeState(
                 roomMemberIdentityStateChanges = listOf(
-                    RoomMemberIdentityStateChange(
-                        identityRoomMember = anIdentityRoomMember(disambiguatedDisplayName = "Alice"),
+                    aRoomMemberIdentityStateChange(
+                        identityRoomMember = anIdentityRoomMember(),
+                        identityState = IdentityState.PinViolation,
+                    ),
+                ),
+            ),
+            anIdentityChangeState(
+                roomMemberIdentityStateChanges = listOf(
+                    aRoomMemberIdentityStateChange(
+                        identityRoomMember = anIdentityRoomMember(displayNameOrDefault = "Alice"),
                         identityState = IdentityState.PinViolation,
                     ),
                 ),
@@ -29,6 +37,14 @@ class IdentityChangeStateProvider : PreviewParameterProvider<IdentityChangeState
         )
 }
 
+internal fun aRoomMemberIdentityStateChange(
+    identityRoomMember: IdentityRoomMember = anIdentityRoomMember(),
+    identityState: IdentityState = IdentityState.PinViolation,
+) = RoomMemberIdentityStateChange(
+    identityRoomMember = identityRoomMember,
+    identityState = identityState,
+)
+
 internal fun anIdentityChangeState(
     roomMemberIdentityStateChanges: List<RoomMemberIdentityStateChange> = emptyList(),
 ) = IdentityChangeState(
@@ -38,7 +54,7 @@ internal fun anIdentityChangeState(
 
 internal fun anIdentityRoomMember(
     userId: UserId = UserId("@alice:example.com"),
-    disambiguatedDisplayName: String = userId.value,
+    displayNameOrDefault: String = userId.extractedDisplayName,
     avatarData: AvatarData = AvatarData(
         id = userId.value,
         name = null,
@@ -47,6 +63,6 @@ internal fun anIdentityRoomMember(
     ),
 ) = IdentityRoomMember(
     userId = userId,
-    disambiguatedDisplayName = disambiguatedDisplayName,
+    displayNameOrDefault = displayNameOrDefault,
     avatarData = avatarData,
 )
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateView.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateView.kt
index 6ff167a8a7..aac05f8684 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateView.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityChangeStateView.kt
@@ -40,13 +40,27 @@ fun IdentityChangeStateView(
             avatar = pinViolationIdentityChange.identityRoomMember.avatarData,
             content = buildAnnotatedString {
                 val learnMoreStr = stringResource(CommonStrings.action_learn_more)
+                val displayName = pinViolationIdentityChange.identityRoomMember.displayNameOrDefault
+                val userIdStr = stringResource(
+                    CommonStrings.crypto_identity_change_pin_violation_new_user_id,
+                    pinViolationIdentityChange.identityRoomMember.userId,
+                )
                 val fullText = stringResource(
-                    id = CommonStrings.crypto_identity_change_pin_violation,
-                    pinViolationIdentityChange.identityRoomMember.disambiguatedDisplayName,
+                    id = CommonStrings.crypto_identity_change_pin_violation_new,
+                    displayName,
+                    userIdStr,
                     learnMoreStr,
                 )
-                val learnMoreStartIndex = fullText.indexOf(learnMoreStr)
                 append(fullText)
+                val userIdStartIndex = fullText.indexOf(userIdStr)
+                addStyle(
+                    style = SpanStyle(
+                        fontWeight = FontWeight.Bold,
+                    ),
+                    start = userIdStartIndex,
+                    end = userIdStartIndex + userIdStr.length,
+                )
+                val learnMoreStartIndex = fullText.lastIndexOf(learnMoreStr)
                 addStyle(
                     style = SpanStyle(
                         textDecoration = TextDecoration.Underline,
diff --git a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityRoomMember.kt b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityRoomMember.kt
index f5ad9295b3..4acfbd5181 100644
--- a/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityRoomMember.kt
+++ b/features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/crypto/identity/IdentityRoomMember.kt
@@ -12,6 +12,6 @@ import io.element.android.libraries.matrix.api.core.UserId
 
 data class IdentityRoomMember(
     val userId: UserId,
-    val disambiguatedDisplayName: String,
+    val displayNameOrDefault: String,
     val avatarData: AvatarData,
 )
diff --git a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/core/UserId.kt b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/core/UserId.kt
index e03069a243..ae6c3de5bd 100644
--- a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/core/UserId.kt
+++ b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/core/UserId.kt
@@ -24,4 +24,9 @@ value class UserId(val value: String) : Serializable {
     }
 
     override fun toString(): String = value
+
+    val extractedDisplayName: String
+        get() = value
+            .removePrefix("@")
+            .substringBefore(":")
 }
diff --git a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt
index 52d45bfc11..cabd222b72 100644
--- a/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt
+++ b/libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/RoomMember.kt
@@ -51,6 +51,12 @@ data class RoomMember(
         isNameAmbiguous -> "$displayName ($userId)"
         else -> displayName
     }
+
+    val displayNameOrDefault: String
+        get() = when {
+            displayName == null -> userId.extractedDisplayName
+            else -> displayName
+        }
 }
 
 enum class RoomMembershipState {
diff --git a/libraries/ui-strings/src/main/res/values/localazy.xml b/libraries/ui-strings/src/main/res/values/localazy.xml
index f3adc853f2..24e35e6e58 100644
--- a/libraries/ui-strings/src/main/res/values/localazy.xml
+++ b/libraries/ui-strings/src/main/res/values/localazy.xml
@@ -252,6 +252,8 @@ Reason: %1$s."</string>
   <string name="common_waiting_for_decryption_key">"Waiting for this message"</string>
   <string name="common_you">"You"</string>
   <string name="crypto_identity_change_pin_violation">"%1$s\'s identity appears to have changed. %2$s"</string>
+  <string name="crypto_identity_change_pin_violation_new">"%1$s’s %2$s identity appears to have changed. %3$s"</string>
+  <string name="crypto_identity_change_pin_violation_new_user_id">"(%1$s)"</string>
   <string name="dialog_title_confirmation">"Confirmation"</string>
   <string name="dialog_title_error">"Error"</string>
   <string name="dialog_title_success">"Success"</string>