diff --git a/Microsoft b/Microsoft
index 9f807c0..2cfa53a 100644
--- a/Microsoft
+++ b/Microsoft
@@ -1197,6 +1197,7 @@
 0.0.0.0 store-images.s-microsoft.com
 0.0.0.0 storecatalogrevocation.storequality.microsoft.com
 0.0.0.0 storeedgefd.dsx.mp.microsoft.com
+0.0.0.0 substrate.office.com
 0.0.0.0 support.microsoft.com
 0.0.0.0 t0.ssl.ak.dynamic.tiles.virtualearth.net
 0.0.0.0 t0.ssl.ak.tiles.virtualearth.net
@@ -1422,6 +1423,7 @@
 :: store-images.s-microsoft.com
 :: storecatalogrevocation.storequality.microsoft.com
 :: storeedgefd.dsx.mp.microsoft.com
+:: substrate.office.com
 :: support.microsoft.com
 :: t0.ssl.ak.dynamic.tiles.virtualearth.net
 :: t0.ssl.ak.tiles.virtualearth.net