diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000000..357736622f
Binary files /dev/null and b/.DS_Store differ
diff --git a/.changeset/eleven-boats-march.md b/.changeset/eleven-boats-march.md
new file mode 100644
index 0000000000..884e3b2d44
--- /dev/null
+++ b/.changeset/eleven-boats-march.md
@@ -0,0 +1,5 @@
+---
+'@core/sync-service': patch
+---
+
+fix: mark one more service-specific error as known
diff --git a/packages/sync-service/lib/electric/db_connection_error.ex b/packages/sync-service/lib/electric/db_connection_error.ex
index 92c4505319..8aeff88cc0 100644
--- a/packages/sync-service/lib/electric/db_connection_error.ex
+++ b/packages/sync-service/lib/electric/db_connection_error.ex
@@ -198,6 +198,24 @@ defmodule Electric.DbConnectionError do
     }
   end
 
+  def from_error(
+        %Postgrex.Error{
+          postgres: %{
+            code: :invalid_authorization_specification,
+            message: "branch " <> _,
+            severity: "FATAL",
+            pg_code: "28000"
+          }
+        } = error
+      ) do
+    %DbConnectionError{
+      message: error.postgres.message,
+      type: :branch_does_not_exist,
+      original_error: error,
+      retry_may_fix?: false
+    }
+  end
+
   def from_error(%Postgrex.Error{postgres: %{code: :admin_shutdown, severity: "FATAL"}} = error) do
     %DbConnectionError{
       message: error.postgres.message,
diff --git a/packages/sync-service/test/electric/db_connection_error_test.exs b/packages/sync-service/test/electric/db_connection_error_test.exs
index ec179b98eb..c7ce37b79b 100644
--- a/packages/sync-service/test/electric/db_connection_error_test.exs
+++ b/packages/sync-service/test/electric/db_connection_error_test.exs
@@ -585,6 +585,28 @@ defmodule Electric.DbConnectionErrorTest do
              } == DbConnectionError.from_error(error)
     end
 
+    test "with branch does not exist error" do
+      error = %Postgrex.Error{
+        message: nil,
+        postgres: %{
+          code: :invalid_authorization_specification,
+          message: "branch 3ibd4pbmos9p does not exist",
+          unknown: "FATAL",
+          severity: "FATAL",
+          pg_code: "28000"
+        },
+        connection_id: nil,
+        query: nil
+      }
+
+      assert %DbConnectionError{
+               message: "branch 3ibd4pbmos9p does not exist",
+               type: :branch_does_not_exist,
+               original_error: error,
+               retry_may_fix?: false
+             } == DbConnectionError.from_error(error)
+    end
+
     test "with an unknown error" do
       error = %DBConnection.ConnectionError{
         message: "made-up error",