Hi @n.bijl, I sent you a direct message in regards to a HAR file request to further investigate the 404 you are experiencing. When you get a chance can you give that a look. The documentation is not currently known to be out of date. If you feel something is missing please let us know so we can add it accordingly.
As far as the Passwordless/verify status question as shared in the linked topic by Lukerollans, below is the quoted answer to that.