The affected Facebook users on Reddit reported they were receiving "sign in" prompts from their Facebook apps, but they had not signed out.
"We're looking into reports of people being logged out and having to login again to access their Facebook accounts. We're working to resolve this issue as quickly as possible. Thank you for your patience," Facebook tweeted.
According to Engadget, the iPhone users appeared most affected by the log-out issue,.
The users on iOS app were having difficulty logging back into their accounts when using two-factor authentication.
"Based on social media posts, many of the people with two-factor authentication enabled were eventually able to log back in, but the SMS codes were very slow to send, and some have had to upload pictures of their ID to regain access".
It was a "configuration change", admitted Facebook in a later tweet, thanking engineers "who fixed the issue and patiently tried to explain the cause to us to no avail".
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)
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