fix vcpe -> vcpe_service
diff --git a/xos/observers/vcpe/steps/sync_vcpetenant.py b/xos/observers/vcpe/steps/sync_vcpetenant.py
index 787b997..53d0c54 100644
--- a/xos/observers/vcpe/steps/sync_vcpetenant.py
+++ b/xos/observers/vcpe/steps/sync_vcpetenant.py
@@ -108,7 +108,7 @@
             if not bbs_addrs:
                 logger.info("failed to find any usable addresses on bbs_slice")
         elif vcpe_service.bbs_server:
-            bbs_addrs.append(vcpe.bbs_server)
+            bbs_addrs.append(vcpe_service.bbs_server)
         else:
             logger.info("neither bbs_slice nor bbs_server is configured in the vCPE")