Are you using just the device handler or the full BI Fusion smartapp (that includes the handler)? For just the device handler, there is a setting called “Auto Sync BI Profile to ST Mode?” that you need to turn on. If that is already on and it isn’t auto syncing, let me know.
If you’re just using the device handler, I’d encourage you to upgrade to BI Fusion, it gives you the same capability plus a lot more: https://community.smartthings.com/t/release-bi-fusion-v3-0-adds-blue-iris-device-type-handler-blue-iris-camera-dth-motion-sensing/103032