How to deactivate two factor authentication in Nextcloud

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I need to deactivate two factor authentication in Nextcloud because…

I configured my smart phone for webauthn for Nextcloud
I mistakenly sold this smart phone
-> I cound't log in Nextcloud

To solve this I temporarily deactivated two factor authentication.
– Reference

If you are interested in how to install webauthn, please go to this post.

How to introduce webauthn to Nextcloud?

I installed webauthn authentication to Nextcloud. Until now I used OTP(One Time Password) authtication and of course nee...

linuxfun.org

2022.03.01

Please log in your server host by SSH or others and do this command.
I use docker-compose, so please assume.

$ sudo docker-compose exec -u www-data nextcloud php occ twofactorauth:state admin
The process control (PCNTL) extensions are required in case you want to interrupt long running commands - see https://www.php.net/manual/en/book.pcntl.php
Additionally the function 'pcntl_signal' and 'pcntl_signal_dispatch' need to be enabled in your php.ini.
Two-factor authentication is enabled for user admin

Enabled providers:
- webauthn
Disabled providers:
- backup_codes
- email
- rcdevsopenotp
- totp
- u2f

We notice “webauthn” is used for two factor authentication.

Next step is to disable it.

$ sudo docker-compose exec -u www-data nextcloud php occ twofactorauth:disable admin webauthn
The process control (PCNTL) extensions are required in case you want to interrupt long running commands - see https://www.php.net/manual/en/book.pcntl.php
Additionally the function 'pcntl_signal' and 'pcntl_signal_dispatch' need to be enabled in your php.ini.
Two-factor provider webauthn disabled for user admin.

We successfully disabled two factor authentication, then you can log in and setup webauthn with new smart phone!

Conclusion

How was it?

I may sometimes do this mistake, so I summrized how to recover!