Sophos Central app for Splunk: which Splunk logs should I check to find errors?

Hello, I've installed, configured, and fixed the typo in sophos_events.py, but the app is not pulling data from Sophos Central/Cloud. Are there any debug settings that can be set, or which Splunk logs should I check to find errors? The API key I'm using works, I've tested it with https://github.com/sophos/Sophos-Central-SIEM-Integration. Thanks!