jetzt funktioniert der notifier!

src/Support/NotificationPayloadFactory.php

@@ -37,8 +37,14 @@ class NotificationPayloadFactory
         $previewSnippet = $this->buildPreviewText($blueprint);
         $reasonText = $this->buildReasonTextEn($blueprint);
 
+
         $landingPageUrl = $this->buildLandingPageUrl($blueprint);
-        $teamsTabLink = $this->buildTeamsTabLink($landingPageUrl);
+        $subjectUrl = $this->resolveSubjectUrl($blueprint);
+
+        $teamsTabLink = $this->buildTeamsTabLink(
+            $landingPageUrl,
+            $subjectUrl
+        );
 
         return [
             'topic' => [
@@ -91,25 +97,53 @@ class NotificationPayloadFactory
     /**
      * Build a Teams deep link to the personal app tab.
      */
-    protected function buildTeamsTabLink(string $webUrl): string
-    {
-        $teamsAppId = trim((string) $this->settings->get(
+/**
+ * Build a Teams deep link to the personal app tab.
+ *
+ * The static landing page is supplied as webUrl. The exact Flarum
+ * discussion or post URL is passed as subEntityId and is exposed by
+ * TeamsJS v2 as context.page.subPageId.
+ */
+        protected function buildTeamsTabLink(
+            string $webUrl,
+            ?string $subjectUrl
+        ): string {
+            $teamsAppId = trim(
+                (string) $this->settings->get(
                     'sbp-jm-msteams-webhook.teams_app_id',
                     self::DEFAULT_TEAMS_APP_ID
-        ));
+                )
+            );
 
             if ($teamsAppId === '') {
                 $teamsAppId = self::DEFAULT_TEAMS_APP_ID;
             }
 
-        return sprintf(
-            'https://teams.microsoft.com/l/entity/%s/%s?webUrl=%s',
-            rawurlencode($teamsAppId),
-            rawurlencode(self::TEAMS_ENTITY_ID),
-            rawurlencode($webUrl)
+            $query = [
+                'webUrl' => $webUrl,
+            ];
+
+            if ($subjectUrl !== null) {
+                $query['context'] = json_encode(
+                    [
+                        'subEntityId' => $subjectUrl,
+                    ],
+                JSON_UNESCAPED_SLASHES
+                    | JSON_THROW_ON_ERROR
+                );
+            }
+           return sprintf(
+                'https://teams.microsoft.com/l/entity/%s/%s?%s',
+                rawurlencode($teamsAppId),
+                rawurlencode(self::TEAMS_ENTITY_ID),
+                http_build_query(
+                    $query,
+                    '',
+                    '&',
+                    PHP_QUERY_RFC3986
+                )
             );
         }
-
     /**
      * Resolve and validate the configured public forum base URL.
      */
@@ -157,7 +191,6 @@ class NotificationPayloadFactory
 
         return null;
     }
-
     /**
      * Resolve the URL to the discussion or exact post.
      */