Nothing specific is yet known about the causes of the failure, but it should be remedied very soon, at least based on experience with previous WhatsApp disruptions. Users will see that the app is trying to connect to the Internet, but in most cases, it stays that way. For the duration of the failure, which began about half an hour ago, you can, of course, use other means of communication.
The app is now available to most users at first glance but seems to continue to have problems with the delivery of messages. So although the login is possible again and the server connection is made, the messages do not seem to be delivered.WhatsApp indicates that both the shipping and the delivery have been made, with the respective contact the messages are not always according to reports from users.