Hi there,
What's the reason to use the tenantId?
Log Analytics property "tenantId" does not equal tenant of Azure AD.
The TenantId column holds the workspace ID for the Log Analytics workspace.
https://learn.microsoft.com/en-us/azure/azure-monitor/logs/log-standard-columns
If you want to use the Log Analytics workspace tenantId (I have no idea why), you can join the data from other tables like Perf\UpdateSummary etc