diff --git a/src/notifications/channels/discord.js b/src/notifications/channels/discord.js
index 5d875ddc..847c1daf 100644
--- a/src/notifications/channels/discord.js
+++ b/src/notifications/channels/discord.js
@@ -21,7 +21,8 @@ export function convertSlackToDiscord(slackPayload) {
       if (block.type === 'section' && block.text) {
         descriptionLines.push(block.text.text);
       }
-      if (block.type === 'fields' && block.fields) {
+      // Fields ride on a section block; 'fields' is tolerated for older payloads.
+      if ((block.type === 'section' || block.type === 'fields') && block.fields) {
         for (const f of block.fields) {
           const raw = f.text || '';
           const parts = raw.split('\n');
diff --git a/src/notifications/channels/teams.js b/src/notifications/channels/teams.js
index 28b86a5e..0b6bc4b9 100644
--- a/src/notifications/channels/teams.js
+++ b/src/notifications/channels/teams.js
@@ -24,7 +24,8 @@ export function convertSlackToTeams(slackPayload) {
           facts: []
         });
       }
-      if (block.type === 'fields' && block.fields) {
+      // Fields ride on a section block; 'fields' is tolerated for older payloads.
+      if ((block.type === 'section' || block.type === 'fields') && block.fields) {
         const currentSection = sections[sections.length - 1] || { facts: [] };
         if (!sections.includes(currentSection)) {
           sections.push(currentSection);
diff --git a/src/notifications/channels/text.js b/src/notifications/channels/text.js
index adad2663..2814c08f 100644
--- a/src/notifications/channels/text.js
+++ b/src/notifications/channels/text.js
@@ -23,7 +23,8 @@ export function slackPayloadToText(slackPayload) {
       if (block.type === 'section' && block.text?.text) {
         lines.push(stripMrkdwn(block.text.text));
       }
-      if (block.type === 'fields' && Array.isArray(block.fields)) {
+      // Fields ride on a section block; 'fields' is tolerated for older payloads.
+      if ((block.type === 'section' || block.type === 'fields') && Array.isArray(block.fields)) {
         for (const field of block.fields) {
           const parts = String(field.text ?? '').split('\n');
           const name = stripMrkdwn(parts[0]);
diff --git a/src/notifications/index.js b/src/notifications/index.js
index 14e3a2ea..1c20acef 100644
--- a/src/notifications/index.js
+++ b/src/notifications/index.js
@@ -89,7 +89,8 @@ export function formatSlackStageMessage(runId, stageId, status, details = {}) {
       },
     },
     {
-      type: 'fields',
+      // Block Kit has no 'fields' block type — fields live on a section block.
+      type: 'section',
       fields,
     },
   ];
@@ -146,7 +147,8 @@ export function formatSlackTaskReportMessage(runId, taskId, trace) {
       },
     },
     {
-      type: 'fields',
+      // Block Kit has no 'fields' block type — fields live on a section block.
+      type: 'section',
       fields: [
         { type: 'mrkdwn', text: `*Run ID:*\n${runId}` },
         { type: 'mrkdwn', text: `*Task:*\n${taskId}` },