Each link has additional ID after the main URL:
Looks like you got lost. We can't seem to find the page you're looking for."
Removing the junk and leaving only main URL: https://gg.deals/pl/game/sherlock-holmes-the-devil-s-daughter/ works.
Do you have any browser plugin that may affect URLs in your message? This ID should be removed during redirection, unless URL is misinterpreted at some point.
We've disabled clicks tracking in email, since generated URLs were not properly parsed by some email clients. All links in new messages should work fine now.