Authentik's own uniqueness is case-sensitive, so 'Boje' and 'boje' pass as
distinct while Matrix treats them as the same localpart. ADR-0011 closed the
takeover vector with on_conflict:fail, but that only bites at login: the user
registers happily and fails later with no explanation. This policy answers where
the mistake is made.
Deliberately reads only prompt_data and never request.user — the stage runs in an
anonymous enrollment context, which is exactly what the previously attached system
policies crashed on.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Thore CimbalandClaude Opus 4.8
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