Hi @jsr749,
We had the same case and were advised that it does not have to be an exact match, but that a substring should be sufficient.
We did not end up going with the retryable errors for other reasons, but substrings of the error messages are the recommended input for this.
Though these are technically not required, we were also advised that if you set the Retryable Errors, you should also set the below attributes (with example values, adjust as you need). RetryWaitTime is wait in minutes.
"maxRetryCount": 10,
"retryWaitTime": 90,
This article helped us a lot when we dove into it:
Good luck!