I am using ownCloud 10.13.1 on ubuntu 20.04 with PHP version 7.4.33.
This version of ownCloud is not compatible with PHP 7.4
You are currently running PHP 7.4.33.
What version of PHP should I be using? I painstakingly followed the owncloud installation instructions.
i think if you get this message then this means that you are actually not running the most recent ownCloud version 10.13.1 (which is compatible with PHP 7.4).
Could it be possible that you have two installations of ownCloud and the one you are currently accessing is an outdated and not updated one?
I completely reinstalled everything and now it is working.