Unable to configure 2FA

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example

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longer
example
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Nextcloud version (eg, 12.0.2): 16.0.3
Operating system and version (eg, Ubuntu 17.04): Raspbian Linux 9.9 (stretch) armv71
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.25 (Raspbian)
PHP version (eg, 7.1): PHP 7.1.31

The issue you are facing:

I can’t enable 2FA and configure it. I’m only able to download the codes.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Set a nextcloud server
  2. Create admin user
  3. Try to set 2FA configuration

The output of your Nextcloud log in Admin > Logging:

I don't know where to find it ... :(

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => 'occ5f1udt10u',
  'passwordsalt' => 'TIEaNKNZgykINW5IqJQ3WcItnQAgLm',
  'secret' => 'DveYl43Y0sfkjATjjHVBLY7lyjrq1paCtQipzn5H78Ti5lRF',
  'trusted_domains' =>
  array (
    0 => 'X.X.X.X',
    1 => 'Y.Y.Y.Y',
  ),
  'datadirectory' => '/var/www/html/nextcloud/data',
  'dbtype' => 'sqlite3',
  'version' => '16.0.3.0',
  'overwrite.cli.url' => 'http://Y.Y.Y.Y/nextcloud',
  'installed' => true,
  'twofactor_enforced' => 'false',
  'twofactor_enforced_groups' =>
  array (
  ),
  'twofactor_enforced_excluded_groups' =>
  array (
  ),
);

The output of your Apache/nginx/system log in /var/log/____:

apach2/access.log

90.125.173.69 - - [12/Aug/2019:23:54:46 +0200] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 732 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:54:37 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:55:16 +0200] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 732 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:54:58 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:55:19 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:55:46 +0200] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 732 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:55:39 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:56:16 +0200] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 732 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:56:00 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
85.98.167.122 - - [12/Aug/2019:23:56:37 +0200] "GET / HTTP/1.0" 200 10977 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:56:20 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:56:46 +0200] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications HTTP/1.1" 200 732 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"
90.125.173.69 - - [12/Aug/2019:23:56:41 +0200] "GET /nextcloud/index.php/apps/logreader/poll?lastReqId=rT679RH4UJLRkrixNsIu HTTP/1.1" 200 923 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/76.0.3809.87 Chrome/76.0.3809.87 Safari/537.36"

Can you elaborate on what you’re doing in this step?

I set my server and it works.
When I say try to set 2FA, I only mean that I go in the settings and under the Title “2FA Authentication”, there is only the back up codes, as shown in the screenshot above.