WebDAV authentication fails after update to 16, web access ok

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Nextcloud version : 16.0.2
Operating system and version : Linux ovt5-web07 4.19.0
Apache or nginx version : Apache/2.4.25 (Debian)
PHP version : 7.1.28

The issue you are facing:
last thursday, I started auto update from 15.0.6 to 16.0.2. After many trials and failures (mostly blocking at step 6), I finished by a manual update (with fear!).
Friday noon, the system was up, web access was OK and CalDAV too. However, connexion to the instance by the desktop (MacOS) app and the mobile (iOS) app is impossible.
It’s not a problem of credentials, id and password are ok.

Here is a screenshot with the error message in Mac Desktop App.

I tried a direct connexion with the MacOs finder, same problem.

When I check the log in Parameters / Admin / Logging, I don’t find any errors related to the failed connexion. I’m not at ease with this journaling system, I don’t know how to reduce the amount for messages (removing info for example).

Is this the first time you’ve seen this error? : Y!

The output of your Nextcloud log in Admin > Logging:

(too many messages, how can I find the interesting ones?)

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

$CONFIG = array (
  'instanceid' => 'ocm6gs5eujtq',
  'passwordsalt' => 'hidden',
  'secret' => 'hidden',
  'trusted_domains' => 
  array (
    0 => 'nuage.pambio.fr',
  'datadirectory' => '/var/www/vhosts/nuage.pambio.fr/httpdocs/data',
  'overwrite.cli.url' => 'http://nuage.pambio.fr',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => '08159_pambio',
  'dbhost' => 'hidden.server',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => '08159_pambio',
  'dbpassword' => 'hidden',
  'installed' => true,
  'mail_domain' => 'pambio.fr',
  'mail_from_address' => 'bienvenue',
  'mail_smtpmode' => 'smtp',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'mail_sendmailmode' => 'smtp',
  'mail_smtphost' => 'smtp.ouvaton.coop',
  'mail_smtpport' => '587',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtpname' => 'hidden',
  'mail_smtppassword' => 'hidden',
  'mail_smtpsecure' => 'tls',
  'updater.secret' => 'hidden',
  'app_install_overwrite' => 
  array (
    0 => 'calendar',

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

(I don't have access to that)

Many thanks for any help!