src/Hotline/Caching/Services/RealtimeCacheManager.cs

@@ -24,7 +24,7 @@ public class RealtimeCacheManager : IRealtimeCacheManager
 
     public async Task<bool> IsInGroupAsync(string useId, string groupName, CancellationToken cancellationToken)
     {
-        var connection = GetConnectionAsync(useId, cancellationToken);
-        return connection.
+        var connection = await GetConnectionAsync(useId, cancellationToken);
+        return connection.IsInGroup(groupName);
     }
 }