This is a problem with the official K2 v.2.10.3 (Joomla 3.10.11, php 7.4).
Reproduce:
Install K2 with default settings.
Create a K2 category.
Create a K2 article.
Create a new menu item for a K2 article.
Write a comment on a new K2 article. => #The anti-spam settings for this website are not yet properly configured and comments cannot yet be published.Please notify the site administrator :)
This is a problem with the official K2 v.2.10.3 (Joomla 3.10.11, php 7.4).
Reproduce: