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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, 20.0.5): 25.0.3
Operating system and version (eg, Ubuntu 20.04): nextcloud AIO docker and Xubuntu 22.10
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): 8.0.26
The issue you are facing:
Basically, since this morning, I’m getting certificate issues but only on desktop application (windows and MAC). On macOS, I’ve killed the app, reopen it again and now I don’t see the certificate error. On Windows (fresh install) I can’t do login because of the message
Is this the first time you’ve seen this error? (Y/N): Y
I’m using caddy reverse proxy
Steps to replicate it:
-
Open nextcloud desktop app
-
I see this message:
-
On web/android/ios is working as expected:
The output of your Nextcloud log in Admin > Logging:
{"reqId":"0MFMkxhUUx52DQNVzVb7","level":2,"time":"2023-02-16T09:00:11+00:00","remoteAddr":"","user":"--","app":"activity","method":"","url":"--","message":"Failed sending activity email to user 'isa'.","userAgent":"--","version":"25.0.3.2","data":{"app":"activity"}}
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',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'nextcloud-aio-redis',
'password' => 'pass',
'port' => 6379,
),
'overwritehost' => 'host',
'overwriteprotocol' => 'https',
'passwordsalt' => 'pass',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'localhost',
1 => 'host',
),
'datadirectory' => '/mnt/ncdata',
'dbtype' => 'pgsql',
'version' => '24.0.7.1',
'overwrite.cli.url' => 'host',
'dbname' => 'nextcloud_database',
'dbhost' => 'nextcloud-aio-database',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'oc_nextcloud',
'dbpassword' => 'pass',
'installed' => true,
'instanceid' => 'id',
'loglevel' => '2',
'log_type' => 'file',
'logfile' => '/var/www/html/data/nextcloud.log',
'log_rotate_size' => '10485760',
'log.condition' =>
array (
'apps' =>
array (
0 => 'admin_audit',
),
),
'preview_max_x' => '2048',
'preview_max_y' => '2048',
'jpeg_quality' => '60',
'enabledPreviewProviders' =>
array (
1 => 'OC\\Preview\\Image',
2 => 'OC\\Preview\\MarkDown',
3 => 'OC\\Preview\\MP3',
4 => 'OC\\Preview\\TXT',
5 => 'OC\\Preview\\OpenDocument',
6 => 'OC\\Preview\\Movie',
0 => 'OC\\Preview\\Imaginary',
),
'enable_previews' => true,
'upgrade.disable-web' => true,
'mail_smtpmode' => 'smtp',
'trashbin_retention_obligation' => 'auto, 30',
'versions_retention_obligation' => 'auto, 30',
'activity_expire_days' => '30',
'simpleSignUpLink.shown' => false,
'share_folder' => '/Shared',
'tempdirectory' => '/mnt/ncdata/tmp/',
'one-click-instance' => true,
'one-click-instance.user-limit' => 100,
'one-click-instance.link' => 'https://nextcloud.com/all-in-one/',
'htaccess.RewriteBase' => '/',
'files_external_allow_create_new_local' => false,
'trusted_proxies' =>
array (
0 => '127.0.0.1',
1 => '::1',
),
'allow_local_remote_servers' => true,
'preview_imaginary_url' => 'http://nextcloud-aio-imaginary:9000',
);
The output of your Apache/nginx/system log in /var/log/____:
Waiting for Nextcloud to start...
Waiting for Nextcloud to start...
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 172.17.0.7. Set the 'ServerName' directive globally to suppress this message
{"level":"info","ts":1676538015.0926313,"msg":"using provided configuration","config_file":"/Caddyfile","config_adapter":""}
{"level":"warn","ts":1676538015.0961509,"msg":"Caddyfile input is not formatted; run the 'caddy fmt' command to fix inconsistencies","adapter":"caddyfile","file":"/Caddyfile","line":2}
{"level":"info","ts":1676538015.0982826,"logger":"admin","msg":"admin endpoint started","address":"localhost:2019","enforce_origin":false,"origins":["//127.0.0.1:2019","//localhost:2019","//[::1]:2019"]}
{"level":"warn","ts":1676538015.0987442,"logger":"http","msg":"automatic HTTPS is completely disabled for server","server_name":"srv0"}
{"level":"info","ts":1676538015.0990899,"logger":"tls.cache.maintenance","msg":"started background certificate maintenance","cache":"0xc0003c4d90"}
{"level":"info","ts":1676538015.1006935,"logger":"http.log","msg":"server running","name":"srv0","protocols":["h1","h2","h3"]}
{"level":"info","ts":1676538015.1010294,"logger":"tls","msg":"cleaning storage unit","description":"FileStorage:/mnt/data/caddy"}
{"level":"info","ts":1676538015.1010976,"msg":"autosaved config (load with --resume flag)","file":"/var/www/.config/caddy/autosave.json"}
{"level":"info","ts":1676538015.101111,"msg":"serving initial configuration"}
{"level":"info","ts":1676538015.1030557,"logger":"tls","msg":"finished cleaning storage units"}
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.