The same issue occurring for me on Safari, iOS 26.4, iPhone 17. That have been happened since a few months ago.

And a log file from the browser.

I got the same issue, opened a ticket and after 3 replies during 21 days, they lead me here.

Here my details:

When i log into the website, it logs successfully in, but instantly logs out and then back in. It is a constant loop and clicking on links doesn*t help and i got this problem for weeks now.

I use windows 11, Mozilla browser, deleted cookies+cache, no VPN, no adblocker.

Things i tried so far: tried to login with WARP, login without WARP, turned off adblocker, turned on adblocker, turned off tracking protextion from firefox, cleared cache (cookie prompt showed up), logged in with mail, logged in with discord, asked the bot for advice

!! (Changing browser is can work, but I don't want to use an additional browser, just for 1 website… it is as helpful as reinstall windows)

-> So far what only worked is to create a private window of firefox and log in there. Then everything works normal.