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Sorry to hear you’re facing problems 
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, 20.0.5): 25.0.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.1 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.52
PHP version (eg, 7.4): PHP 8.1.2-1ubuntu2.10
The issue you are facing:
I had originally enabled E2EE, but disabled it when I was attempting to connect Joplin to Nextcloud by using an app password. Image shows that E2EE should be disabled.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Create an app password
- Attempt to connect Joplin
- Review error message
The output of your Nextcloud log in Admin > Logging:
{"reqId":"7SFxezh9rBzlL0kijixE","level":3,"time":"2023-02-17T16:46:54-06:00","remoteAddr":"x.y.z.quack","user":"nextcloud_user","app":"webdav","method":"DELETE","url":"/remote.php/dav/files/nextcloud_user/Joplin/locks/2_1_532709541a644880b1f95af22e795976.json","message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","userAgent":"Joplin/1.0","version":"25.0.3.2","exception":{"Exception":"OCA\\DAV\\Connector\\Sabre\\Exception\\Forbidden","Message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"checkLock","class":"OCA\\EndToEndEncryption\\Connector\\Sabre\\LockPlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":456,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":360,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":171,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/end_to_end_encryption/lib/Connector/Sabre/LockPlugin.php","Line":122,"message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","exception":[],"CustomMessage":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content"},"id":"63f003df08e08"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => 'saltypassword',
'secret' => 'secretsecret',
'trusted_domains' =>
array (
0 => 'cloud[dot]domain[dot]com',
1 => '172.16.x.y',
2 => 'localhost',
),
'trusted_proxies' =>
array (
0 => 'proxy[dot]domain[dot]com',
1 => '172.16.x.proxy',
),
'forwarded-for-headers' =>
array (
0 => 'X-Forwarded-For',
1 => 'HTTP_X_FORWARDED_FOR',
),
'overwriteprotocol' => 'https',
'overwritehost' => 'cloud[dot]domain[dot]com',
'overwrite.cli.url' => 'https://cloud[dot]domain[dot]com/',
'datadirectory' => '/mnt/ncdata',
'dbtype' => 'pgsql',
'version' => '25.0.3.2',
'dbname' => 'nextcloud_db',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'db_user',
'dbpassword' => 'secretsecret',
'installed' => true,
'instanceid' => 'icantswim',
'upgrade.disable-web' => true,
'log_type' => 'file',
'logfile' => '/var/log/nextcloud/nextcloud.log',
'loglevel' => '2',
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'remember_login_cookie_lifetime' => '1800',
'log_rotate_size' => '10485760',
'trashbin_retention_obligation' => 'auto, 60',
'versions_retention_obligation' => 'auto, 180',
'activity_expire_days' => '120',
'simpleSignUpLink.shown' => false,
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => true,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.5,
'dbindex' => 0,
'password' => 'secretpassword',
),
'default_phone_region' => 'us',
'logtimezone' => 'America/Chicago',
'htaccess.RewriteBase' => '/',
'maintenance' => false,
'mail_smtpmode' => 'smtp',
'mail_smtphost' => 'smtp[dot]hostname[dot]com',
'mail_sendmailmode' => 'smtp',
'mail_smtpport' => '465',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpsecure' => 'ssl',
'mail_from_address' => 'cloud',
'mail_domain' => 'domain[dot]com',
'mail_smtpname' => 'cloud[at]domain[dot]com',
'mail_smtppassword' => 'secretsecret',
'twofactor_enforced' => 'true',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
);
The output of your Apache/nginx/system log in /var/log/____:
[Fri Feb 17 16:58:58.462904 2023] [access_compat:error] [pid 90591:tid 139699414873664] [client 172.16.x.proxy:34456] AH01797: client denied by server configuration: /var/www/nextcloud/remote.php
[Fri Feb 17 16:58:58.463239 2023] [access_compat:error] [pid 90591:tid 139699414873664] [client 172.16.x.proxy:34456] AH01797: client denied by server configuration: /var/www/nextcloud/dav
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
{"reqId":"v8ws1klxDPGfnifK5LC3","level":3,"time":"2023-02-17T17:02:28-06:00","remoteAddr":"x.y.z.quack","user":"nextcloud_user","app":"webdav","method":"PUT","url":"/remote.php/dav/files/nextcloud_user/Joplin/locks/2_1_532709541a644880b1f95af22e795976.json","message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","userAgent":"Joplin/1.0","version":"25.0.3.2","exception":{"Exception":"OCA\\DAV\\Connector\\Sabre\\Exception\\Forbidden","Message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"checkLock","class":"OCA\\EndToEndEncryption\\Connector\\Sabre\\LockPlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":456,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":360,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":171,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/end_to_end_encryption/lib/Connector/Sabre/LockPlugin.php","Line":122,"message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","exception":{},"CustomMessage":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content"}}
{"reqId":"GP5U8NWaoLQYALXzifsH","level":3,"time":"2023-02-17T17:02:29-06:00","remoteAddr":"x.y.z.quack","user":"nextcloud_user","app":"webdav","method":"DELETE","url":"/remote.php/dav/files/nextcloud_user/Joplin/locks/2_1_532709541a644880b1f95af22e795976.json","message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","userAgent":"Joplin/1.0","version":"25.0.3.2","exception":{"Exception":"OCA\\DAV\\Connector\\Sabre\\Exception\\Forbidden","Message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"checkLock","class":"OCA\\EndToEndEncryption\\Connector\\Sabre\\LockPlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":456,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":360,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":171,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/end_to_end_encryption/lib/Connector/Sabre/LockPlugin.php","Line":122,"message":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content","exception":{},"CustomMessage":"Client \"Joplin/1.0\" is not allowed to access end-to-end encrypted content"}}
Error message as shown from Joplin:
Last error: Error: DELETE locks/2_1_532709541a644880b1f95af22e795976.json: Client "Joplin/1.0" is not allowed to access end-to-end encrypted content (Exception OCA\DAV\Connector\Sabre\Exception\Forbidden) (403): <?xml version="1.0" encoding="utf-8"?> <d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:o="http://owncloud.org/ns"> <s:exception>OCA\DAV\Connector\Sabre\Exception\Forbidden</s:exception> <s:message>Client "Joplin/1.0" is not allowed to access end-to-end encrypted content</s:message>```