diff --git a/src/dispatch/plugins/dispatch_slack/enums.py b/src/dispatch/plugins/dispatch_slack/enums.py
index e7585c37da68..58125b82562a 100644
--- a/src/dispatch/plugins/dispatch_slack/enums.py
+++ b/src/dispatch/plugins/dispatch_slack/enums.py
@@ -2,8 +2,10 @@
 
 
 class SlackAPIGetEndpoints(DispatchEnum):
+    chat_permalink = "chat.getPermalink"
     conversations_history = "conversations.history"
     conversations_info = "conversations.info"
+    team_info = "team.info"
     users_conversations = "users.conversations"
     users_info = "users.info"
     users_lookup_by_email = "users.lookupByEmail"
diff --git a/src/dispatch/plugins/dispatch_slack/incident/interactive.py b/src/dispatch/plugins/dispatch_slack/incident/interactive.py
index 3251ca205527..37b2235fb232 100644
--- a/src/dispatch/plugins/dispatch_slack/incident/interactive.py
+++ b/src/dispatch/plugins/dispatch_slack/incident/interactive.py
@@ -931,6 +931,11 @@ def handle_member_joined_channel(
     participant = incident_flows.incident_add_or_reactivate_participant_flow(
         user_email=user.email, incident_id=context["subject"].id, db_session=db_session
     )
+
+    if not participant:
+        # Participant is already in the incident channel.
+        return
+
     participant.user_conversation_id = context["user_id"]
 
     incident = incident_service.get(db_session=db_session, incident_id=context["subject"].id)
diff --git a/src/dispatch/plugins/dispatch_slack/service.py b/src/dispatch/plugins/dispatch_slack/service.py
index d7b4271ba136..aa44b5d46d02 100644
--- a/src/dispatch/plugins/dispatch_slack/service.py
+++ b/src/dispatch/plugins/dispatch_slack/service.py
@@ -86,6 +86,12 @@ def list_conversation_messages(client: WebClient, conversation_id: str, **kwargs
     )
 
 
+@functools.lru_cache()
+def get_domain(client: WebClient) -> str:
+    """Gets the team's Slack domain."""
+    return make_call(client, SlackAPIGetEndpoints.team_info)["team"]["domain"]
+
+
 @functools.lru_cache()
 def get_user_info_by_id(client: WebClient, user_id: str) -> dict:
     """Gets profile information about a user by id."""
@@ -195,7 +201,7 @@ def create_conversation(client: WebClient, name: str, is_private: bool = False)
     return {
         "id": response["id"],
         "name": response["name"],
-        "weblink": f"https://slack.com/app_redirect?channel={response['id']}",
+        "weblink": f"https://{get_domain(client)}.slack.com/app_redirect?channel={response['id']}",
     }
 
 
@@ -270,6 +276,15 @@ def add_users_to_conversation(
                 pass
 
 
+def get_message_permalink(client: WebClient, conversation_id: str, ts: str) -> str:
+    return make_call(
+        client,
+        SlackAPIGetEndpoints.chat_permalink,
+        channel=conversation_id,
+        message_ts=ts,
+    )
+
+
 def send_message(
     client: WebClient,
     conversation_id: str,
@@ -294,7 +309,7 @@ def send_message(
     return {
         "id": response["channel"],
         "timestamp": response["ts"],
-        "weblink": f"https://slack.com/app_redirect?channel={response['id']}",  # TODO should we fetch the permalink?
+        "weblink": get_message_permalink(client, response["channel"], response["ts"]),
     }
 
 
@@ -318,7 +333,7 @@ def update_message(
     return {
         "id": response["channel"],
         "timestamp": response["ts"],
-        "weblink": f"https://slack.com/app_redirect?channel={response['id']}",  # TODO should we fetch the permalink?
+        "weblink": get_message_permalink(client, response["channel"], response["ts"]),
     }