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&gt; I had an issue above when I tried this for a reference using “old_api_name”.
Can you say more about what exactly the issue was?

Unless `Error` is a python `Exception` defined in your code, I’m not sure if that would work since `require_output` returns a `KeyError`. You could try:
```try:
  output_value: str = stack.require_output("new_api_name")
except KeyError:
  output_value: str = stack.require_output("old_api_name")```
Alternatively, you could use `get_output` instead of `require_output` so it doesn’t error and fetch the “old_api_name” if `None` is returned:
```output_value = stack.get_output("new_api_name")
if output_value is None:
  output_value = stack.get_output("old_api_name")```

I don’t believe I returned a key error. I wrote something similar to get_output code above. None was not returned and it didn’t function.