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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): 21.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.2
Apache or nginx version (eg, Apache 2.4.25): nginx/1.18.0
PHP version (eg, 7.4): 7.4.19
The issue you are facing:
Activity RSS Feed lands on 404 page
Is this the first time you’ve seen this error? (Y/N):
Y
Steps to replicate it:
- Go to Activity tab of NC
- Click the cog in lower left and enable RSS feed
- Go to the resulting link and it is 404 page
The output of your Nextcloud log in Admin > Logging:
nothing in nc logs when configuring / accessing the RSS url (last entry in NC log is 5 days ago)
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\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'redis',
'port' => 6379,
),
'datadirectory' => '/data',
'instanceid' => '[REDACTED]',
'passwordsalt' => '[REDACTED]',
'secret' => '[REDACTED]',
'trusted_domains' =>
array (
0 => '192.168.1.115:9443',
1 => '[REDACTED]',
),
'trusted_proxies' =>
array (
0 => '192.168.1.115',
),
'dbtype' => 'mysql',
'version' => '21.0.2.1',
'dbname' => 'nextcloud',
'dbhost' => 'db',
'dbport' => '3306',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '[REDACTED]',
'dbpassword' => '[REDACTED]',
'installed' => true,
'mail_from_address' => '[REDACTED]',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'gmail.com',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.gmail.com',
'mail_smtpport' => '587',
'mail_smtpname' => '[REDACTED]',
'mail_smtppassword' => '[REDACTED]',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpsecure' => 'tls',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'has_rebuilt_cache' => true,
'default_phone_region' => '[REDACTED]',
'twofactor_enforced' => 'true',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'overwrite.cli.url' => '[REDACTED]',
);
The output of your Apache/nginx/system log in /var/log/____:
there is nothing in nginx error.log, there is this in nginx acces log when trying to load the RSS link
[REDACTED] - - [02/Jun/2021:09:23:55 +0100] "GET /apps/activity/rss.php?token=[REDACTED] HTTP/1.1" 404 185 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.214 Safari/537.36"
I have tried posting the issue on github, but after submitting it ended up on github error page.
