In my findings, the issues still exists. Microsoft Graph REST API has a known issue as highlighted in this page: directoryaudit-list
Also, note that the link provided in your question hints the issue when when retrieving the signInActivity property, as follows:
This error is due to intermittent license check failures, which we are working to fix. As a temporary workaround, add the Directory.Read.All permission. This temporary workaround will not be required when the issue is resolved.
So, hopefully, the issue expected to be resolved soon
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