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Dear Rose Gould-Lardelli,
Good day! Thank you for posting in our community. Your question is "Issues with Microsoft logging into wrong email address after entering user details and password".
This happens because the old account information was cached on the browser. Please try clearing browser cache or opening the link from incognito/inprivate window.
Clear cache:
Click "settings" in browser >> search for "cache" >> choose what to clear >> clear now
Open incognito window/inprivate window:
Thank you for your cooperation and have a nice day!
Best Regards,