On Jun 16, 2020 Jakuje replied to a question regarding the "auto-challenge-checker".
An excerpt from that reply is below.
When I click the map link in the reply, project-gc displays a completely blank (web) page. There are no cache icons or or list of caches, etc.
How do I initiate the auto-challenge-checker and view the results? Do I log into geocaching.com to see the updated challenge cache icons?
Thanks, TeamVista
"Premium members have challenge checker executed automatically and in Challenge caches map you already see (or can filter) if you qualify for a challenge or not by bottom-left corner -- green tick mark means you do and the red sign means you don't.
https://project-gc.com/Tools/Challenges?map"