Did you find the old (ignored) thread in the bug forum? There are some network settings you can change related to IPv4/IPv6 so you can log in. It's not great, but it's more than nothing. Kabam hasn't responded to any thread on this issue since November beyond deleting some posts when people said things out of frustration that they thought were too rude or inflammatory.
https://forums.playcontestofchampions.com/en/discussion/comment/1708465
Thanks. https://forums.playcontestofchampions.com/en/discussion/comment/1708465 Looks like this is for android only tho. Is there a way to change IPv4/6 on Apple?