You can find this information in the audit log.
Make sure auditing is enabled, enable the LoginFailure audit event, and you should see the detailed reason for failure there.
It is available in 2022.1, it just hasn't hit the documentation yet. You can go ahead and use it.
Here is some documentation on %G and other global utilities, as well as Routine utilities.
https://docs.intersystems.com/priordocexcerpts/prgglobalchui-41.pdf
https://docs.intersystems.com/priordocexcerpts/prgroutinechui-41.pdf
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