diff --git a/eng/pipelines/templates/steps/auth-dev-feed.yml b/eng/pipelines/templates/steps/auth-dev-feed.yml
index 1935e30932a9..88ae9b122114 100644
--- a/eng/pipelines/templates/steps/auth-dev-feed.yml
+++ b/eng/pipelines/templates/steps/auth-dev-feed.yml
@@ -23,4 +23,4 @@ steps:
     displayName: 'Pip Authenticate to feed'
     inputs:
       artifactFeeds: $(DevFeedName)
-      onlyAddExtraIndex: true
\ No newline at end of file
+      onlyAddExtraIndex: false
\ No newline at end of file
diff --git a/eng/tox/tox.ini b/eng/tox/tox.ini
index 289f55c6911c..6532abee42cf 100644
--- a/eng/tox/tox.ini
+++ b/eng/tox/tox.ini
@@ -43,6 +43,7 @@ platform = linux: linux
 passenv = *
 setenv =
   SPHINX_APIDOC_OPTIONS=members,undoc-members,inherited-members
+  PIP_EXTRA_INDEX_URL=https://pypi.python.org/simple
 deps = {[base]deps}
 changedir = {toxinidir}
 install_command = python -m pip install {opts} {packages} --cache-dir {toxinidir}/../.tox_pip_cache_{envname}
@@ -225,6 +226,7 @@ changedir =
   {toxinidir}
 passenv = *
 setenv =
+  {[testenv]setenv}
   DEPENDENCY_TYPE=Latest
 commands =
     {[deptestcommands]commands}
@@ -240,6 +242,7 @@ deps =
 changedir = {toxinidir}
 passenv = *
 setenv =
+  {[testenv]setenv}
   DEPENDENCY_TYPE=Minimum
 commands =
     {[deptestcommands]commands}
diff --git a/scripts/devops_tasks/common_tasks.py b/scripts/devops_tasks/common_tasks.py
index f7704eb97bb7..60ffe3b69f36 100644
--- a/scripts/devops_tasks/common_tasks.py
+++ b/scripts/devops_tasks/common_tasks.py
@@ -383,7 +383,7 @@ def find_whl(package_name, version, whl_directory):
 def install_package_from_whl(
     package_whl_path, working_dir, python_sym_link=sys.executable
 ):
-    commands = [python_sym_link, "-m", "pip", "install", package_whl_path]
+    commands = [python_sym_link, "-m", "pip", "install", package_whl_path, "--extra-index", "https://pypi.python.org/simple"]
     run_check_call(commands, working_dir)
     logging.info("Installed package from {}".format(package_whl_path))
 
diff --git a/scripts/devops_tasks/test_regression.py b/scripts/devops_tasks/test_regression.py
index 8c9491a01efd..69908135fd82 100644
--- a/scripts/devops_tasks/test_regression.py
+++ b/scripts/devops_tasks/test_regression.py
@@ -274,7 +274,7 @@ def _install_packages(self, dependent_pkg_path, pkg_to_exclude):
                 "Installing filtered dev requirements from {}".format(filtered_dev_req_path)
             )
             run_check_call(
-                [python_executable, "-m", "pip", "install", "-r", filtered_dev_req_path],
+                [python_executable, "-m", "pip", "install", "-r", filtered_dev_req_path, "--extra-index", "https://pypi.org/simple"],
                 dependent_pkg_path,
             )
         else: