500 / Couldn't initiate registration about webauthn HOT 2 CLOSED

FWIW, it sounds like your Apache wasn't originally set up to run PHP, so just delivered it as text, like it would html.(The AddType directive, or the equivalent if you're using FPM). Your reset included that properly.

Glad your key now works.

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Just an update. For anyone who stumbles across this later.

This issue had absolutely nothing to do with this script. It was something screwed up with the server. I spent hours checking raw logs, and gained no information at all.

I don't know quite "why", but I went into my server, and set the MultiPHP INI Editor files back to default, and then re-selected the items I needed (such as fopen); restarted apache / php, and for some unknown god forsaken reason, it started to work.

I don't know why, but 7 hours later I finally was able to register and then authenticate myself using my Yubikey.

from webauthn.