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Go to the Azure Security Center to check for alerts or recommendations from the pen tests.
If you have Microsoft Defender for Cloud enabled, look at the security recommendations and alerts for recent findings.
https://learn.microsoft.com/en-us/azure/defender-for-cloud/managing-and-responding-alerts
Check the Activity Log in the Azure Portal for entries about security assessments or penetration tests.
https://learn.microsoft.com/en-us/azure/azure-monitor/essentials/activity-log-insights
If you have Compliance Manager, it can show you information about security assessments and pen tests for compliance. Depending on your Azure subscription and agreements, Microsoft might give you detailed reports
https://learn.microsoft.com/en-us/purview/compliance-manager-assessments
If you have any further queries, do let us know.
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