You mean onprem AD or Azure AD? For Azure AD, the logging for both is available in the security and compliance portal: protection.office.com
You can search the audit logs there by going to Search > Audit Logs > create a new search. It will generate a report of whatever activity you choose.
If you want to unify Onprem AD and Office 365 logs, you'll need to implement Azure Sentinel, I believe.
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