Login to this forum with GitHub does not work in Safari

Github login just recently stopped working for me in Safari. Even allowing pop-ups, I get this window:

Tried clearing cookies to no avail. Works in Brave and probably Chrome, though I don’t use it much.

I moved your post to a new topic since that was an ancient topic for something completely different (i.e. the transition of the forum to its current domain)

GitHub login works for me on iOS Safari. Don’t know about desktop Safari, since I’m on the move.

Thanks for the move. Yes, works for me on Safari iOS. Stopped working on desktop Safari about 2-3 days ago. I’ve whitelisted it in the Block/Allow prefs. Not sure what else is going on.