Fun with FIS IBS Web connector

Do you mean you have been rate limited with a 429 response code? What are the details of the error? Usually rate limits will produce an error telling you how long you have to wait before trying again. If there is a retry time limit, you could try configuring the retry logic on the web service connector to wait the correct amount of time for a 429 error response code.

https://documentation.sailpoint.com/connectors/webservices/help/integrating_webservices/retry_configurations.html