Import users can't use Lost Password

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Nextcloud version 20.0.4:
Operating system and version (Ubuntu 18.04):
Apache or nginx version _ Apache 2.4.29_:
PHP version 7.2:

The issue you are facing:
Contacts created manualy can use "Forgot Password " => mail is sent …
Contacts imported from file .vcf are visible by admin but can’t use “Forgot Password” ! => client receive “mail sent” but server log says “could not find user”

Is this the first time you’ve seen this error? (Y):
new install

Steps to replicate it:

  1. import users
  2. one of these users use "Forgot Password "

The output of your Nextcloud log in Admin > Logging:

Could not send password reset email: Could not find user

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

<?php
$CONFIG = array (
  'instanceid' => 'oc7hm3ts4610',
  'passwordsalt' => 'xxx',
  'secret' => 'xxx',
  'trusted_domains' => 
  array (
    0 => 'xxx',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '20.0.4.0',
  'overwrite.cli.url' => 'xxx/nextcloud',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpsecure' => 'ssl',
  'mail_from_address' => 'xxx',
  'mail_domain' => 'xxx',
  'mail_smtphost' => 'xxx',
  'mail_smtpport' => '465',
  'mail_smtpauth' => 1,
  'mail_smtpname' => 'xxx',
  'mail_smtppassword' => 'xxx',
);

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

PASTE HERE

Well, these are just contact in your address book, no? You have to create a user on the system and set a mail address for the reset…