diff --git a/tools/create_sitting_approvals.py b/tools/create_sitting_approvals.py
index 3165732..f61d6a4 100644
--- a/tools/create_sitting_approvals.py
+++ b/tools/create_sitting_approvals.py
@@ -156,7 +156,7 @@ def main() -> int:
     try:
         _create(rows, origin.rstrip("/"), receipt)
     except Exception as error:
-        receipt["failure"] = str(error) if isinstance(error, Refused) else "contained_operation_failed"
+        receipt["failure"] = str(error) if isinstance(error, Refused) else "contained_operation_failed:" + type(error).__name__
         print(receipt["failure"], file=sys.stderr)
         return 2
     finally:
@@ -236,6 +236,7 @@ def _create(rows, origin, receipt):
         algorithms=["RS256"],
         issuer=ISSUER,
         audience="approval-engine",
+        leeway=30,
         options={"strict_aud": True, "require": ["sub", "iat", "exp", "iss", "aud"]},
     )
     roles = claims.get("roles")