diff --git a/manifester/commands.py b/manifester/commands.py
index 9e1a0c2..28d87b9 100644
--- a/manifester/commands.py
+++ b/manifester/commands.py
@@ -73,11 +73,12 @@ def delete(allocations, all_, remove_manifest_file):
 @cli.command()
 @click.option("--details", is_flag=True, help="Display full inventory details")
 @click.option("--sync", is_flag=True, help="Fetch inventory data from RHSM before displaying")
-def inventory(details, sync):
+@click.option("--offline-token", type=str, default=None)
+def inventory(details, sync, offline_token):
     """Display the local inventory file's contents."""
     border = "-" * 38
     if sync:
-        helpers.update_inventory(Manifester(minimal_init=True).subscription_allocations)
+        helpers.update_inventory(Manifester(minimal_init=True, offline_token=offline_token).subscription_allocations)
     inv = helpers.load_inventory_file(Path(settings.inventory_path))
     if not details:
         logger.info("Displaying local inventory data")
diff --git a/manifester/manifester.py b/manifester/manifester.py
index c32594d..010e879 100644
--- a/manifester/manifester.py
+++ b/manifester/manifester.py
@@ -9,7 +9,7 @@
 import string
 
 from dynaconf.utils.boxing import DynaBox
-from requests.exceptions import Timeout
+from requests.exceptions import RequestException, Timeout
 
 from manifester.helpers import (
     fetch_paginated_data,
@@ -33,7 +33,12 @@ def __init__(
         **kwargs,
     ):
         if minimal_init:
-            self.offline_token = settings.get("offline_token")
+            if kwargs.get("offline_token") is not None:
+                self.offline_token = kwargs.get("offline_token")
+            elif settings.get("offline_token") is not None:
+                self.offline_token = settings.get("offline_token")
+            else:
+                raise KeyError("Offline token not defined.")
             self.token_request_url = settings.get("url").get("token_request")
             self.allocations_url = settings.get("url").get("allocations")
             self._access_token = None
@@ -110,6 +115,8 @@ def access_token(self):
                 cmd_args=[f"{self.token_request_url}"],
                 cmd_kwargs=token_request_data,
             ).json()
+            if "error" in token_data:
+                raise RequestException(f"{token_data['error']}: {token_data['error_description']}")
             if self.is_mock:
                 self._access_token = token_data.access_token
             else: