Certificate "4355" has been revoked

I recently installed NC.
Error:
Certificate “4355” has been revoked

[/details]

Nextcloud version (eg, 20.0.5): latest as of March 15th. Not sure how to find it while looking with in NC site.
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.02
Apache or nginx version (eg, Apache 2.4.25): replace me
PHP version (eg, 7.4): 7.4

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

Add Joplin app
2.
3.

The output of your Nextcloud log in Admin > Logging:

Error	settings	Exception: Certificate "4355" has been revoked	
2021-04-07T19:50:27-0400
Error	PHP	Error: Invalid argument supplied for foreach() at /var/www/clients/client1/web13/web/apps/serverinfo/lib/OperatingSystems/DefaultOs.php#149	
2021-04-07T19:48:38-0400
Error	settings	Exception: Certificate "4355" has been revoked	
2021-04-07T17:36:32-0400
Error	settings	Exception: Certificate "4355" has been revoked	
2021-04-07T17:36:30-0400
Error	settings	Exception: Certificate "4355" has been revoked	
2021-04-07T17:36:17-0400
Error	PHP	require(): Failed opening required '/var/www/clients/client1/web13/web/apps/mail/vendor/composer/../rubix/tensor/src/constants.php' (include_path='/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Crypt_Blowfish:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Date:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Exception:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Idna:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Imap_Client:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_ListHeaders:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Mail:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_ManageSieve:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Mime:/var/www/clients/client1/web13/web/apps/mail/vendor/pear-pear.horde.org/Horde_Nls:/var/www/cli at /var/www/clients/client1/web13/web/apps/mail/vendor/composer/autoload_real.php#73

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

PASTE HERE

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE

This problem seems to be related to the Joplin app. The following issue ticket my help you getting the problem solved: