--- a/testing/mozharness/configs/releases/dev_postrelease_firefox_beta.py
+++ b/testing/mozharness/configs/releases/dev_postrelease_firefox_beta.py
@@ -11,10 +11,10 @@ config = {
         "clone_upstream_url": "https://hg.mozilla.org/mozilla-unified",
     },
     # date is used for staging mozilla-beta
     "push_dest": "ssh://hg.mozilla.org/projects/date",
     "ignore_no_changes": True,
     "ssh_user": "ffxbld",
     "ssh_key": "~/.ssh/ffxbld_rsa",
     "ship_it_root": "https://ship-it-dev.allizom.org",
-    "ship_it_username":  "stage-ffxbld",
+    "ship_it_username":  "ship_it-stage-ffxbld",
 }

--- a/testing/mozharness/configs/releases/dev_postrelease_firefox_release.py
+++ b/testing/mozharness/configs/releases/dev_postrelease_firefox_release.py
@@ -13,10 +13,10 @@ config = {
         "vcs": "hg",
         "clone_upstream_url": "https://hg.mozilla.org/mozilla-unified",
     },
     "push_dest": "ssh://hg.mozilla.org/projects/jamun",
     "ignore_no_changes": True,
     "ssh_user": "ffxbld",
     "ssh_key": "~/.ssh/ffxbld_rsa",
     "ship_it_root": "https://ship-it-dev.allizom.org",
-    "ship_it_username":  "stage-ffxbld",
+    "ship_it_username":  "ship_it-stage-ffxbld",
 }

--- a/testing/mozharness/configs/releases/postrelease_firefox_beta.py
+++ b/testing/mozharness/configs/releases/postrelease_firefox_beta.py
@@ -9,10 +9,10 @@ config = {
         "clone_upstream_url": "https://hg.mozilla.org/mozilla-unified",
     },
     "vcs_share_base": "/builds/hg-shared",
     "push_dest": "ssh://hg.mozilla.org/releases/mozilla-beta",
     "ignore_no_changes": True,
     "ssh_user": "ffxbld",
     "ssh_key": "~/.ssh/ffxbld_rsa",
     "ship_it_root": "https://ship-it.mozilla.org",
-    "ship_it_username":  "ffxbld",
+    "ship_it_username":  "ship_it-ffxbld",
 }

--- a/testing/mozharness/configs/releases/postrelease_firefox_esr52.py
+++ b/testing/mozharness/configs/releases/postrelease_firefox_esr52.py
@@ -13,10 +13,10 @@ config = {
         "clone_upstream_url": "https://hg.mozilla.org/mozilla-unified",
     },
     "vcs_share_base": "/builds/hg-shared",
     "push_dest": "ssh://hg.mozilla.org/releases/mozilla-esr52",
     "ignore_no_changes": True,
     "ssh_user": "ffxbld",
     "ssh_key": "~/.ssh/ffxbld_rsa",
     "ship_it_root": "https://ship-it.mozilla.org",
-    "ship_it_username":  "ffxbld",
+    "ship_it_username":  "ship_it-ffxbld",
 }

--- a/testing/mozharness/configs/releases/postrelease_firefox_release.py
+++ b/testing/mozharness/configs/releases/postrelease_firefox_release.py
@@ -13,10 +13,10 @@ config = {
         "clone_upstream_url": "https://hg.mozilla.org/mozilla-unified",
     },
     "vcs_share_base": "/builds/hg-shared",
     "push_dest": "ssh://hg.mozilla.org/releases/mozilla-release",
     "ignore_no_changes": True,
     "ssh_user": "ffxbld",
     "ssh_key": "~/.ssh/ffxbld_rsa",
     "ship_it_root": "https://ship-it.mozilla.org",
-    "ship_it_username":  "ffxbld",
+    "ship_it_username":  "ship_it-ffxbld",
 }