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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 18.0.2): 19.0.0.12
Operating system and version (eg, Ubuntu 20.04): CentOS Linux release 7.8.2003
Apache or nginx version (eg, Apache 2.4.25): nginx/1.18.0
PHP version (eg, 7.1): PHP 7.3.19
The problem you’re facing:
I will say that the system, with the configuration provided by you for nginx, the application works wonderfully, except for this small detail:
trying to connect the client, in the access log I see the API accesses that return the HTTP codes 304 and 404.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Download client for windows
- Insert connection server address
- view nginx access logs
The output of your Nextcloud log in Admin > Logging:
I can't find this log
The output of your config.php file in /config/config.php (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
"log_type" => "file",
"logfile" => "nextcloud.log",
"loglevel" => 4,
"logdateformat" => "F d, Y H:i:s",
'log.condition' => [
'apps' => ['admin_audit'],
],
"overwriteprotocol" => "https",
'instanceid' => 'ocks46chgop5',
'passwordsalt' => 'X3xAlTFCyQKtHG55j4WYqFholdHqSx',
'secret' => '4+IkW1IDe5C83dNfWWxhvi6KGxGtn2Yy/KdHgcAvQxbG5FcG',
'trusted_domains' =>
array (
0 => 'cloud.therascals.it',
),
'datadirectory' => '/var/www/vhosts/cloud.therascals.it/httpdocs/data',
'dbtype' => 'mysql',
'version' => '19.0.0.12',
'overwrite.cli.url' => 'https://cloud.therascals.it',
'dbname' => 'XXXXXX',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'XXXXXXX',
'dbpassword' => 'XXXXXXXX',
'installed' => true,
'mail_from_address' => 'cloud',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'therascals.it',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => 'smtps.*.it',
'mail_smtpport' => '465',
'mail_smtpsecure' => 'ssl',
);
[root@srv1 httpdocs]#
The output of your Apache/nginx/system log in /var/log/____:
[0.347 0.347 .] - cloud.therascals.it - 2.38.84.52 - - [28/Jun/2020:16:13:56 +0200] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 304 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0"
[0.448 0.448 .] - cloud.therascals.it - 2.38.84.52 - - [28/Jun/2020:16:13:57 +0200] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 304 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0"
[0.359 0.359 .] - cloud.therascals.it - 2.38.84.52 - - [28/Jun/2020:16:14:07 +0200] "POST /login/v2/poll HTTP/1.1" 404 2 "-" "Mozilla/5.0 (Windows) mirall/2.6.4stable-Win64 (build 20200303) (Nextcloud)"
==> /var/www/logs/cloud.therascals.it/error.log <==
==> /var/www/logs/cloud.therascals.it/access.log <==
[0.358 0.358 .] - cloud.therascals.it - 2.38.84.52 - - [28/Jun/2020:16:14:26 +0200] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 304 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0"
[0.292 0.293 .] - cloud.therascals.it - 2.38.84.52 - - [28/Jun/2020:16:14:27 +0200] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 304 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0"