Hi @TheGregle-0373,
How long did you have the Sentinel connectors enabled? It may take 24 hours for the data to show up after enabling a connector. I'm not sure if there's a conflict (checking with the Sentinel team on that one), but it looks like someone with a similar issue was able to get these by querying for the alerts.
// who is providing alerts
SecurityAlert
| summarize count() by ProviderName
// which alerts and names, sorted by severity
SecurityAlert
| summarize count() by ProviderName, AlertName, AlertSeverity
| sort by AlertSeverity desc