UPDATE 2/18:
“There will be no changes to Microsoft users’ commercial (Microsoft Entra) or consumer (Microsoft account) sign in experiences in February,” confirms Alex Simons, corporate vice president of identity & network access program management at Microsoft, in a statement to The Verge. “Media reports were based on incomplete information mistakenly published by a Microsoft product team. The incorrect notifications have been removed.”
www.theverge.com
If you sign in on your own computer, your browser will remember your sign-in information, but if you sign in on a computer, phone or tablet that doesn't belong to you, or is accessed by other people, you should follow the steps below to use a private browsing window instead.
Private browsing ensures that others won't be able to:
support.microsoft.com
“There will be no changes to Microsoft users’ commercial (Microsoft Entra) or consumer (Microsoft account) sign in experiences in February,” confirms Alex Simons, corporate vice president of identity & network access program management at Microsoft, in a statement to The Verge. “Media reports were based on incomplete information mistakenly published by a Microsoft product team. The incorrect notifications have been removed.”

Microsoft isn’t automatically keeping you signed in to your account just yet
Microsoft blames a mistake on notifications

Microsoft Support:
Your sign-in experience is changing
The web browser sign-in experience is changing when you sign in to any product or service using your Microsoft account. Starting in February 2025, you will stay signed in automatically unless you sign out or use private browsing.If you sign in on your own computer, your browser will remember your sign-in information, but if you sign in on a computer, phone or tablet that doesn't belong to you, or is accessed by other people, you should follow the steps below to use a private browsing window instead.
Private browsing ensures that others won't be able to:
- Access your Microsoft account, OneDrive or Outlook.com mailbox.
- See your search and browsing history.
Source:
Avoid staying signed in on a public computer - Microsoft Support

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