diff --git a/backend/common/authorizer.py b/backend/common/authorizer.py
index 970b8bb324637..74eaa2c7e993a 100644
--- a/backend/common/authorizer.py
+++ b/backend/common/authorizer.py
@@ -2,14 +2,22 @@
 from functools import lru_cache
 
 import requests
+from requests.adapters import HTTPAdapter
+from urllib3 import Retry
 from backend.common.corpora_config import CorporaAuthConfig
 from backend.common.utils.http_exceptions import UnauthorizedError
 from backend.common.utils.jwt import jwt_decode, get_unverified_header
 
-auth0_session_with_retry = requests.Session()
-# TODO: these read the configuration on initialization and cause problems with tests
-# retry_config = Retry(total=3, backoff_factor=1, status_forcelist=CorporaAuthConfig().retry_status_forcelist)
-# auth0_session_with_retry.mount("https://", HTTPAdapter(max_retries=retry_config))
+_auth0_session_with_retry = None
+
+
+def get_auth0_session_with_retry():
+    global _auth0_session_with_retry
+    if _auth0_session_with_retry is None:
+        _auth0_session_with_retry = requests.Session()
+        retry_config = Retry(total=3, backoff_factor=1, status_forcelist=CorporaAuthConfig().retry_status_forcelist)
+        _auth0_session_with_retry.mount("https://", HTTPAdapter(max_retries=retry_config))
+    return _auth0_session_with_retry
 
 
 def assert_authorized_token(token: str, audience: str = None) -> dict:
@@ -46,7 +54,7 @@ def assert_authorized_token(token: str, audience: str = None) -> dict:
 
 def get_userinfo_from_auth0(token: str) -> dict:
     auth_config = CorporaAuthConfig()
-    res = auth0_session_with_retry.get(auth_config.api_userinfo_url, headers={"Authorization": f"Bearer {token}"})
+    res = get_auth0_session_with_retry().get(auth_config.api_userinfo_url, headers={"Authorization": f"Bearer {token}"})
     res.raise_for_status()
     return res.json()
 
@@ -57,7 +65,7 @@ def get_openid_config(openid_provider: str):
     :param openid_provider: the openid provider's domain.
     :return: the openid configuration
     """
-    res = auth0_session_with_retry.get("{op}/.well-known/openid-configuration".format(op=openid_provider))
+    res = get_auth0_session_with_retry().get("{op}/.well-known/openid-configuration".format(op=openid_provider))
     res.raise_for_status()
     return res.json()
 
@@ -69,5 +77,5 @@ def get_public_keys(openid_provider: str):
     :param openid_provider: the openid provider's domain.
     :return: Public Keys
     """
-    keys = auth0_session_with_retry.get(get_openid_config(openid_provider)["jwks_uri"]).json()["keys"]
+    keys = get_auth0_session_with_retry().get(get_openid_config(openid_provider)["jwks_uri"]).json()["keys"]
     return {key["kid"]: key for key in keys}
diff --git a/backend/layers/business/business.py b/backend/layers/business/business.py
index 30c31861a19c6..35f4a20c40872 100644
--- a/backend/layers/business/business.py
+++ b/backend/layers/business/business.py
@@ -3,7 +3,6 @@
 import logging
 from typing import Iterable, Optional, Tuple
 
-from backend.common.providers.crossref_provider import CrossrefDOINotFoundException, CrossrefException
 from backend.layers.business.business_interface import BusinessLogicInterface
 from backend.layers.business.entities import (
     CollectionMetadataUpdate,
@@ -50,7 +49,11 @@
     Link,
 )
 from backend.layers.persistence.persistence_interface import DatabaseProviderInterface
-from backend.layers.thirdparty.crossref_provider import CrossrefProviderInterface
+from backend.layers.thirdparty.crossref_provider import (
+    CrossrefDOINotFoundException,
+    CrossrefException,
+    CrossrefProviderInterface,
+)
 from backend.layers.thirdparty.s3_provider import S3ProviderInterface
 from backend.layers.thirdparty.step_function_provider import StepFunctionProviderInterface
 from backend.layers.thirdparty.uri_provider import UriProviderInterface
diff --git a/tests/unit/backend/layers/api/test_portal_api.py b/tests/unit/backend/layers/api/test_portal_api.py
index 5df85b2523b7d..cef7a155c0ae8 100644
--- a/tests/unit/backend/layers/api/test_portal_api.py
+++ b/tests/unit/backend/layers/api/test_portal_api.py
@@ -24,7 +24,7 @@
 
 from furl import furl
 
-from backend.common.providers.crossref_provider import CrossrefDOINotFoundException, CrossrefFetchException
+from backend.layers.thirdparty.crossref_provider import CrossrefDOINotFoundException, CrossrefFetchException
 from backend.portal.api.collections_common import verify_collection_body
 from tests.unit.backend.layers.common.base_test import (
     DatasetArtifactUpdate,
diff --git a/tests/unit/backend/layers/business/test_business.py b/tests/unit/backend/layers/business/test_business.py
index 5542efe1c9e33..6e4c710778483 100644
--- a/tests/unit/backend/layers/business/test_business.py
+++ b/tests/unit/backend/layers/business/test_business.py
@@ -4,7 +4,11 @@
 from unittest.mock import Mock
 from uuid import uuid4
 
-from backend.common.providers.crossref_provider import CrossrefDOINotFoundException, CrossrefException
+from backend.layers.thirdparty.crossref_provider import (
+    CrossrefDOINotFoundException,
+    CrossrefException,
+    CrossrefProviderInterface,
+)
 from backend.layers.business.business import (
     BusinessLogic,
     CollectionMetadataUpdate,
@@ -36,7 +40,6 @@
 )
 from backend.layers.persistence.persistence import DatabaseProvider
 from backend.layers.persistence.persistence_mock import DatabaseProviderMock
-from backend.layers.thirdparty.crossref_provider import CrossrefProviderInterface
 from backend.layers.thirdparty.s3_provider import S3ProviderInterface
 from backend.layers.thirdparty.step_function_provider import StepFunctionProviderInterface
 from backend.layers.thirdparty.uri_provider import FileInfo, UriProviderInterface