diff --git a/app/services/twilio/incoming_message_service.rb b/app/services/twilio/incoming_message_service.rb
index 7a335c87d..c38577599 100644
--- a/app/services/twilio/incoming_message_service.rb
+++ b/app/services/twilio/incoming_message_service.rb
@@ -137,14 +137,19 @@ class Twilio::IncomingMessageService
   end
 
   def download_with_auth(media_url)
-    Down.download(
-      media_url,
-      http_basic_authentication: [twilio_channel.account_sid, twilio_channel.auth_token || twilio_channel.api_key_sid]
-    )
+    auth_credentials = if twilio_channel.api_key_sid.present?
+                         # When using api_key_sid, the auth token should be the api_secret_key
+                         [twilio_channel.api_key_sid, twilio_channel.auth_token]
+                       else
+                         # When using account_sid, the auth token is the account's auth token
+                         [twilio_channel.account_sid, twilio_channel.auth_token]
+                       end
+
+    Down.download(media_url, http_basic_authentication: auth_credentials)
   end
 
   def handle_download_attachment_error(error, media_url)
-    Rails.logger.info "Error downloading attachment from Twilio: #{error.message}: Retrying"
+    Rails.logger.info "Error downloading attachment from Twilio: #{error.message}: Retrying without auth"
     Down.download(media_url)
   rescue StandardError => e
     Rails.logger.info "Error downloading attachment from Twilio: #{e.message}: Skipping"