Mac OS CalDAV account verification failed

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Nextcloud version (eg, 20.0.5): 20.0.07 (Snap)
Operating system and version (eg, Ubuntu 20.04): 20.04
Apache or nginx version (eg, Apache 2.4.25): Apache behind Apache Reverse Proxy
PHP version (eg, 7.4): 7.4

The issue you are facing: Set up Calendar on iPad - authenticated no problem.
Then tried to set up Contacts on same iPad but failed. For troubleshooting reasons I deleted the Calendar account and went through the whole process again through the Contacts section of the IOS but again failed.
I entered the same details back into the Calendar section of the IOS but have not since deleting the account been able to connect again - getting the ‘account verification failed’ message each time.
Is there something I missed when deleting the account from the iPad?
Do I need to remove some account details from the Database?

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

Steps to replicate it:

  1. Add CalDAV account details on iPad
  2. Delete account from iPad
  3. Re-enter CalDAV account details again

The output of your Nextcloud log in Admin > Logging:

 No log pertaining to this issue that I could see.

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


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


Your help is appreciated