Is there a way using powershell or Graph API to obtain information about the user who created or registered an application in Azure AD?

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https://graph.microsoft.com/v1.0/auditLogs/directoryAudits?&$filter=activityDisplayName eq 'Add application' and targetResources/any(c:c/id eq 'application object id').

Then look at the intitedBy property in the response.