I have been unable to log into the game properly since the morning after the 2v2 update dropped. It always gets stuck on "Authenticating User", after which it fails and I land in game anyway, with all the leaderboards missing and blank ranked options. A very important piece of info here is that I have a PiHole (a Raspberry Pi configured to yoink trackers and ads before they hit any of my devices) hooked up to my local wifi network. I figured something about the servers had changed and that I just needed to troubleshoot it. After finally having a chance to test this more thoroughly, I have tried:
Alternate DNS options (1.1.1.1, 8.8.8.8, 1.0.0.1)
Whitelisting EVERY unity-related entry that shows up in my PiHole logs
Completely disabling the PiHole before booting up the game
Using Ethernet without a proper over-the-air wifi connection to skip the PiHole, just in case
5g vs non-5g wifi options
The only thing that has worked so far was connecting my PC to my phone's hotspot, which of course is unbearably slow and I don't want to imagine what ping is going to be like if I get host with my own being 300ms by default. At this point, I don't think the PiHole is responsible for the issues due to the game still not working even after fully disabling it. Notably, custom lobbies have worked the whole time; only ranked is missing.
I honestly don't expect much of a solution here, but if anything about the server protocol or how authentication works was changed, knowing that might help me find a solution so I can just play the game again 