so basically, your iCloud has been disabled, i don’t know how that came about but that’s what i was told
The thing is i had this same issue a while back, for the first week I didn’t notice anything wrong but then after a while I noticed no mails were coming in, mind you this was in July, but I was finally able to get it fixed last week
what I did was that I called Apple support, then I told the Apple employee that attended to me that I had already tried all trouble shooting methods I could find on the Apple support app and prior to that i was already given a case id because i contacted them through Apple message, so i just gave her the case id and she was able to read the chat to see what trouble shooting methods i had done already
After about 30 minutes on the call, she concluded that my iCloud was disabled and then she filed a complaint that was forwarded to the senior engineering team, she also asked me if i had an alternative email in which she could contact me and keep me updated on the situation
she then forwarded the complaint and then my Apple ID was back to normal after two days. She was really nice and she took her time to attend to me
NOTE: i did have to screen share so she could see exactly what the problem was.
The number i called was this: 1-800-275-2273
and below is a screenshot of my chat with Apple support through which i got the case id and the call back