diff --git a/app/models/project_services/chat_message/base_message.rb b/app/models/project_services/chat_message/base_message.rb
index 22a65b5145e7cb2cb2ae08dadb82269818a9516c..f710fa85b5d439bfd35a9fe476734248b2b397ec 100644
--- a/app/models/project_services/chat_message/base_message.rb
+++ b/app/models/project_services/chat_message/base_message.rb
@@ -26,13 +26,18 @@ module ChatMessage
       end
     end
 
-    def pretext
+    def summary
       return message if markdown
 
       format(message)
     end
 
+    def pretext
+      summary
+    end
+
     def fallback
+      format(message)
     end
 
     def attachments
diff --git a/app/models/project_services/chat_message/pipeline_message.rb b/app/models/project_services/chat_message/pipeline_message.rb
index 2135122278a79a36a5d00f7eddab239fa830aefb..96fd23aede335f7db3a7e3fcb17ddf6a6f287793 100644
--- a/app/models/project_services/chat_message/pipeline_message.rb
+++ b/app/models/project_services/chat_message/pipeline_message.rb
@@ -23,10 +23,6 @@ module ChatMessage
       ''
     end
 
-    def fallback
-      format(message)
-    end
-
     def attachments
       return message if markdown
 
diff --git a/app/models/project_services/microsoft_teams_service.rb b/app/models/project_services/microsoft_teams_service.rb
index 2facff53e26375db61f048869282d668900b35b1..99500caec0e3f700ec2beec912d8c6628e960d6b 100644
--- a/app/models/project_services/microsoft_teams_service.rb
+++ b/app/models/project_services/microsoft_teams_service.rb
@@ -44,7 +44,7 @@ class MicrosoftTeamsService < ChatNotificationService
   def notify(message, opts)
     MicrosoftTeams::Notifier.new(webhook).ping(
       title: message.project_name,
-      pretext: message.pretext,
+      summary: message.summary,
       activity: message.activity,
       attachments: message.attachments
     )
diff --git a/changelogs/unreleased/42342-teams-pipeline-notifications.yml b/changelogs/unreleased/42342-teams-pipeline-notifications.yml
new file mode 100644
index 0000000000000000000000000000000000000000..4ef3a35465bf54db7c06e786608235989448e50d
--- /dev/null
+++ b/changelogs/unreleased/42342-teams-pipeline-notifications.yml
@@ -0,0 +1,5 @@
+---
+title: Fixes Microsoft Teams notifications for pipeline events
+merge_request: 19632
+author: Jeff Brown
+type: fixed
diff --git a/lib/microsoft_teams/notifier.rb b/lib/microsoft_teams/notifier.rb
index c08d3e933a899dbba845ecb7e818b75a4da62aed..226ee1373db0b231b4d9eff0765a0cfb4f497a1b 100644
--- a/lib/microsoft_teams/notifier.rb
+++ b/lib/microsoft_teams/notifier.rb
@@ -30,7 +30,7 @@ module MicrosoftTeams
       result = { 'sections' => [] }
 
       result['title'] = options[:title]
-      result['summary'] = options[:pretext]
+      result['summary'] = options[:summary]
       result['sections'] << MicrosoftTeams::Activity.new(options[:activity]).prepare
 
       attachments = options[:attachments]
diff --git a/spec/lib/microsoft_teams/notifier_spec.rb b/spec/lib/microsoft_teams/notifier_spec.rb
index 3035693812ffcea090297f2e76b6e7a1cef94e65..c9756544bd62fb52c48ef0997d9c13d16b26e882 100644
--- a/spec/lib/microsoft_teams/notifier_spec.rb
+++ b/spec/lib/microsoft_teams/notifier_spec.rb
@@ -8,7 +8,7 @@ describe MicrosoftTeams::Notifier do
   let(:options) do
     {
       title: 'JohnDoe4/project2',
-      pretext: '[[JohnDoe4/project2](http://localhost/namespace2/gitlabhq)] Issue [#1 Awesome issue](http://localhost/namespace2/gitlabhq/issues/1) opened by user6',
+      summary: '[[JohnDoe4/project2](http://localhost/namespace2/gitlabhq)] Issue [#1 Awesome issue](http://localhost/namespace2/gitlabhq/issues/1) opened by user6',
       activity: {
         title: 'Issue opened by user6',
         subtitle: 'in [JohnDoe4/project2](http://localhost/namespace2/gitlabhq)',
diff --git a/spec/models/project_services/microsoft_teams_service_spec.rb b/spec/models/project_services/microsoft_teams_service_spec.rb
index 8d9ee96227f7b3e41d70ea352e5798e041cd263c..3351c6280b409fd1e5f379c5d4537e5b52e84842 100644
--- a/spec/models/project_services/microsoft_teams_service_spec.rb
+++ b/spec/models/project_services/microsoft_teams_service_spec.rb
@@ -225,10 +225,15 @@ describe MicrosoftTeamsService do
 
       it 'calls Microsoft Teams API for pipeline events' do
         data = Gitlab::DataBuilder::Pipeline.build(pipeline)
+        data[:markdown] = true
 
         chat_service.execute(data)
 
-        expect(WebMock).to have_requested(:post, webhook_url).once
+        message = ChatMessage::PipelineMessage.new(data)
+
+        expect(WebMock).to have_requested(:post, webhook_url)
+          .with(body: hash_including({ summary: message.summary }))
+          .once
       end
     end