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Nextcloud version (eg, 12.0.2):
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The issue you are facing:
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What security questions are you referring to?
Do you mean the section under your personal settings, where you can create app passwords, see your latest sessions and so on?
I have never seen anything like that on Nextcloud so far
I’m only aware of the backup codes in case you use two-factor authentification and the second-factor object is not working for any reason. But I haven’t defined any answers to backup questions (like 'what is your mothers birth-name?).
Is it possible you are/ were using an external authentication mechanism where it is possible to define such answers?
No, it’s not from a third party. I recently signed up for the free disroot email service which led me to the disroot cloud. I was playing with certain scenarios (pentesting) and wanted to see what would happen if I lost my password. The service doesn’t allow a backup email and it prompts three security questions when you sign up for the service. That’s fine but what if you want to edit/change those questions?
I’m closing here. Issue does not seem to be related to Nextcloud. In the future, please put all important information in the initial post, @Schmu had to ask twice until you provided clearer information.