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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): 18.0.4
Operating system and version (eg, Ubuntu 20.04): UNRAID 6.8.3 DOCKER
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):
The issue you are facing: Windows and Mac Desktop Clients showing dialog to enter E2E passphrase
There has NEVER been any encryption enabled in the Nextcloud Server -
Is this the first time you’ve seen this error? (Y/N): I have been running server since version 12 - this issue seemed to start in the last few updates.
Steps to replicate it:
- Start Desktop Client App
- Shortly after connection the “enter E2E passphrase” dialogue comes up
- Cancel the dialog and App works as desired
The output of your Nextcloud log in Admin > Logging:
DO NOT KNOW HOW TO GET THIS INFO
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'memcache.local' => '\\OC\\Memcache\\APCu',
'datadirectory' => '/data',
'instanceid' => 'ocb74pae1pxa',
'passwordsalt' => 'QG/8iDIofsUEnpOHuMT/Jlij1nHQ0E',
'secret' => '9l2KDYZhYSWvdHNh4ADW/Jfb2ouDqsVmEJLNl2DuEPr4Q9Y+',
'trusted_domains' =>
array (
0 => 'nextcloud.XXXXXXXXXX.com',
1 => '192.168.1.5:444',
),
'overwrite.cli.url' => 'https://nextcloud.XXXXXXXXXX.com',
'trusted_proxies' => ['letsencrypt'],
'overwritehost' => 'nextcloud.XXXXXXXXXX.com',
'overwriteprotocol' => 'https',
'dbtype' => 'mysql',
'version' => '16.0.1.1',
'dbname' => 'nextcloud',
'dbhost' => '192.168.1.5:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_Me',
'dbpassword' => 'JVeGH35iAuWQy/6vBkIvfH+Dv6UrT0',
'installed' => true,
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_from_address' => 'nextcloud',
'mail_domain' => 'XXXXXXXXXX.com',
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '587',
'mail_smtpsecure' => 'tls',
'mail_smtpname' => 'me@XXXXXXXXXX.com',
'mail_smtppassword' => 'nqwwpkwjifadcdim',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'mysql.utf8mb4' => true,
);
The output of your Apache/nginx/system log in /var/log/____:
DO NOT KNOW HOW TO GET THIS INFO