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In a non-Docker installation it is apparently found under
config/settings.yml
and should look like this:
reserved_usernames: - admin - support - help - root - webmaster - administrator - mod - moderator
It would be good if admins were able to control this list.
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While I can see the internal usage of that config variable, it does not seem to be documented at https://docs.joinmastodon.org/admin/config/ so I am not sure how stable that is.
Generally we have decided to use the .env configuration for the instance, as that is the documented way, compared to using .yml
I also wonder if this is just not implemented upstream yet, but according to https://github.com/mastodon/mastodon/blob/main/config/settings.yml#L1 the admin UI should eventually have that setting exposed.