Starting with Chrome 81, changes to the SafeSite cookie attribute result in wikidot's current cookie implementation no longer working, and users can no longer log in.
Google announced their intent to do this in May 2019 and sent reminders in October.
https://blog.chromium.org/2019/05/improving-privacy-and-security-on-web.html
https://blog.chromium.org/2019/10/developers-get-ready-for-new.html
This is going to be highly disruptive to the 75,000+ members of the SCP Foundation wiki. Please remediate this ASAP.
Can confirm this is an ongoing issue with Chrome and Chromium-based browsers. Permitting it requires users to add site exceptions for wikidot.com, which is difficult for non-technically-inclined users and this issue is not clear from the UI.
Please update the issuing domain for session cookies soon. Chrome has a ~70% market share, meaning this issue affects an extremely large number of users.
Chromium bug filed as frankly I have no faith that Wikidot will ever fix this.
https://bugs.chromium.org/p/chromium/issues/detail?id=1060639
Noting that Chromium has rolled this change back until late summer as a response to COVID-19 and teams being underequipped to remediate their changes, so we've got a couple months reprieve.