Happening to me as well. I think it started 7-10 days ago, but is not consistent about when it lets me log in. A few times it went through after a 5-10 minute wait, but mostly just freezes and sits there. Loading some GOG games to fill the time, but Mother’s Blessing is a joke if you can’t get in to play.
12/25 persists happening to me after trying to repair the files and then uninstalling and reinstalling. I’ve been able to get in once, but now can’t get back in. Stuck at Logging into Diablo IV. No Music. Can’t select Cancel or Exit. After a few minutes it force closes. No error messages
I’ve started having this issue as well after upgrading from an RTX 20-series to 40-series GPU. It seems random when it works or doesn’t. Haven’t been able to figure it out yet.